The finishing.com Hotline Public Forum

• Coating for low electrical resistance, but high corrosion resistance and wear resistance (February 25)

Does bronze corrode Cr-Mo-V steel? (February 17) open Q.

• Stainless Steel or Galvanized fasteners for Aluminum Siding (February 17) open Q.

• How to avoid rust (February 9)

• Best solution to prevent tarnish on silver plated small accessories? (February 3)

• Which substitute for hard chromium plating? open Q. (February 2)

What is this finish? open Q. (January 30)

• PTFE thin film coating of 316L Stainless steel parts exposed to sulfuric acid open Q. (January 27)

Alternatives to gold plating for Zari thread open Q. (January 24)

Building a scintillator. How to get a bright/reflective surface? (January 13)

Plating/Coating/Finishing Metal Charms (December 13)

Affordable copper infrared reflector high temperature transparent coating (November 30)

Galvanic compatible material mating to Aluminum and Nickel (November 30)

What base/substrate material for gold plated electrodes? (November 21)

What spring material is resistant to 30% HCl? (November 14)

Establishing a standard for matte black finish (November 11)

Want rainbow iridescent coating open Q. (November 10)

Nitrile Rubber not bonding properly to mild steel pipe open Q. (November 8)

Need zinc-gold plating on stainless steel RFQ (November 3)

Want gold colored finishes without use of gold (October 29)

• What happens to stainless spring if attached to part while it's zinc plated? open Q. (October 29)

• Looking for linear grinding/finishing tool practical for non-production use open Q. (January 16)

• How to Mirror Finish Alumina Ceramics open Q. (January 15)

Ra vs. Rz: Ra keeps growing, Rz stays the same? (January 2)

• Deburring of Aluminum components (November 22)

Polishing Stainless Steel to a Mirror Finish (November 20)

• How to etch silver without affecting aluminum? (February 24)

• Zinc Phosphate coating problems (February 19) open Q.

Rack marks in zinc phosphating open Q. (February 4)

Want good salt spray hours from phosphating without oil open Q. (January 14)

• Dip vs. Spray Phosphating (January 11)

• Carbon Smut Problems in Plating; Pretreatment for Adhesion (December 21)

• Chemical removal of heat treating scale and oxides open Q. (December 7)

• Pretreatment for ZnTi alloy. 95% Zn, 5% Ti open Q. (November 29)

• Manganese phosphating or black oxide on S7 tool steel & gun parts (November 12)

• Unusual reaction of Bohler K390 steel to phosphoric acid open Q. (November 11)

• Pickling and Passivating of Welded Carbon Steel Pipes (November 6)

• 718 nickel parts discolor when pickled after EDM (November 6)

Masking for Silver Plating Inside Hollow Aluminum Cylinders (January 24)

• Masking of keyways when anodizing & electroplating (November 27)

• Ferritic stainless steel surface finishing (February 24)

• Citric vs. Nitric Acid Passivation of Stainless Steel (February 11)

• Electropolish, Passivate, or Chemical Polish 4140 & 4340 Steel? (February 10)

• Rinsing after Stainless Steel Passivation (February 4)

Acids for electropolishing stainless steel (February 3)

• Problems with passivation and salt spray testing of 15-5 PH stainless steel (February 1)

• Will grit size affect passivation of stainless steel? open Q. (January 29)

• Anodizing of titanium with stainless steel attached (December 31)

Need durable black coating for stainless steel (December 21)

• Do I have to passivate after mag particle inspection? (December 10)

• Formulation or Citric or Sulfamic acid pickling solution for 12L14? (December 2)

• Sodium Dichromate passivation (ASTM A967) Q&As (November 24)

• Baffling Citric Acid passivation bath issue open Q. (November 17)

• Sudden drop in Alodine concentration (February 25) open Q.

• White corrosion on anodized job after salt spray test (February 25)

Numerous Type II Aluminum Anodizing Defects: White Spots, Missing Color, Ink Stains (February 24) open Q.

• Anodized Part Absorbs Grease into Oxide Layer Near Edges (February 23) open Q.

• Problems with Color of Hardcoat Anodize (February 23)

• How to etch and color anodized aluminum (February 18) open Q.

• How much air agitation for Hard Anodizing of Aluminum (February 17)

Anodizing seal issue on bead blasted areas (February 17)

• Micropitting issue chromate conversion coating of Aluminum (February 15)

How to eliminate anodizing appearance variations (February 9)

• Anodizing Color Fades in Autoclave (February 5)

• Water stain prevention for aluminum (February 5)

Anodizing Appearance Problem on Silkscreened Panels open Q. (January 27)

Brown discoloration after clear anodizing (January 26)

• Aluminum piping underground. How to do corrosion protection? (January 11)

Dissolved Aluminum in Anodizing bath -- How Much to Have, How to Analyze/Titrate, How to Correct/Adjust It (January 10)

High Dielectric Anodizing of Aluminum (January 6)

Galvanic potential of aluminum after conversion coating (January 4)

• Aluminum anodizing: Constant current vs. controlling the voltage open Q. (December 28)

• Anodizing vs. e-coating of aluminum (December 22)

Anodizing 7075 & 7xxx aluminum. Problems & Solutions, Q&A's open Q. (December 22)

• Which coating for magnesium parts to protect against corrosion? open Q. (December 18)

• Adding sulfuric acid additions while anodizing (December 11)

• Salt Spray Test after Hard Anodising (December 9)

• Zincate doesn't stick to aluminum bus bar from some suppliers (December 9)

• Energy savings in high temperature Type II anodizing (December 5)

Shot Blast Aluminum Casting for Dark Color (December 2)

Beadblasted aluminium dark shadows when anodised (December 2)

• Sharp edges not anodising and dyeing (November 25)

• Brushed, glossy anodizing on 70's & 80's HiFi Front Panels? open Q. (November 22)

• Applications for room-temperature hard anodizing open Q. (November 20)

• Two new polymer-based seals for anodized Aluminum: Non-Hazardous, No metals open Q. (November 19)

Sulfuric Anodized 2024 Al turning Pink open Q. (November 19)

• Non nitric acid baths for bright dipping aluminum open Q. (November 14)

• PVDF over 25 micron anodising open Q. (November 10)

Sulfuric Acid Anodizing Type IIB procedure & problems (November 10)

• Aluminum cathodes for anodizing tanks (November 6)

• Parameters for Pulse Hardcoat Anodizing 2xxx Aluminum (November 1)

• Electroplating of iron onto bismuth shot (February 26) open Q.

Marks and hazy spots after gold plating jewelry (February 25) open Q.

• Problem in grinding Hard Chrome plating (February 25) open Q.

• Tin plating anode problems (February 25)

White patches in Chrome Plating (February 23) open Q.

Purplish brown discoloration of gold plating (February 23) open Q.

• White bronze plating has opaque white cloudiness (February 23) open Q.

• Peel off problem from semi bright nickel (February 23)

• Chrome Plating Problems on Gravure Printing Cylinders/Rolls (February 21) open Q.

• Restoring gold Iridite color to diecast parts (February 21) open Q.

Haze on Ni-Cr plating surface (February 20)

• Economical iron electroplating; How to make up ferrous sulfate solution (February 19) open Q.

Chrome plated hydraulic cylinder rods have pits (February 15)

• Nickel plating is coming out black (February 15)

Pits, Stain marks on Nickel Plating open Q. (February 15)

• What makes up silver plating solution? open Q. (February 15)

• Plating of Rare-earth Neodymium Magnets open Q. (February 12)

• Alkaline Zinc Nickel Plating of Hardened Steels open Q. (February 9)

• Q&A: Tin plated parts turn yellowish (February 4)

• Help repairing chrome cylinder rods open Q. (January 30)

• What types of plating can be done in a barrel? open Q. (January 30)

Zinc electroplating with yellow passivation is dull open Q. (January 30)

• My brass plating is nickel color instead of yellow open Q. (January 29)

• Zinc-Nickel Plating is 'silver' color in Black Passivation bath open Q. (January 29)

Acid Copper Plating Problems open Q. (January 29)

Plating both outside AND inside of a tube open Q. (January 22)

Tin-Silver Electroplating over Copper Pillar Bump open Q. (January 20)

Manufacturing Process of Nickel Sulphate and Nickel Chloride (January 20)

Black Nickel Bath Formula for Barrel Plating (January 18)

• Emissivity value for Cadmium plated steel and Zinc Plated Steel open Q. (January 16)

• White Patches in Trivalent Chrome Plating open Q. (January 15)

• Can lack of ZnCl2 additions cause chloride zinc roughness? open Q. (January 12)

• Hard Chrome Plating Additives? HEEF Advantages? MSA? (January 12)

• How thick is the chromate on zinc-nickel plating? open Q. (January 11)

• How to do brass plating on stainless steel (January 11)

• How much voltage and amperage for barrel acid zinc plating? open Q. (January 11)

• How did zinc plating pass 550-hour salt spray? open Q. (January 8)

Need to touch up Cadmium plate (January 6)

• Black spots on zinc plated parts with trivalent chromate open Q. (December 26)

• Electroplating with Brass (Electrodeposition of Brass) (December 26)

• Water marks in alkaline zinc plating open Q. (December 22)

• Thiourea and Polyethylene Glycol for acid copper plating additives (December 23)

• Hard Chrome Plating on Aluminum Q&A;s, Problems & Solutions (December 21)

Stain Issues Gold Plating 3 Microns on Sterling Silver open Q. (December 21)

• Recommended tin plating thickness on bus bars? open Q. (December 16)

• Gold plating of aluminum open Q. (December 15)

• Gold plate on brass with pen/brush plater? open Q. (December 14)

• Bronze Plating for Watch Components RFQ (December 14)

• Iron contamination in zinc-nickel plating tank open Q. (December 13)

• Nickel Contamination of Gold Bath without a known source open Q. (December 11)

• Will silver dissolve in cyanide without rectifier current? open Q. (December 7)

• Gold plated aluminum blisters when baked open Q. (December 7)

• Nickel plating on leaded steel bubbles at soldering temperature (December 5)

• Plating chrome on a nickel substrate open Q. (December 3)

• Peel off in hard chrome plating after chemical additions open Q. (December 2)

• Process detail for electroplating diamond coating RFQ (November 30)

Zinc plating defects (Quality of metal finishing) open Q. (November 28)

• Non-Uniform Nickel Plating Deposit (November 28)

• Brighteners for Gold Plating open Q. (November 28)

• Adhesion issue between electroless nickel and cyanide silver plating open Q. (November 28)

• Turn iron into gold color (November 27)

• Need chromate-based anti-tarnish for silver plating RFQ (November 25)

• Zinc Plating with Black Passivation comes off during handling (November 24)

Chromate Rubs Off open Q. (November 24)

Best electrically conductive plating for mild steel rodent traps? (November 24)

• Problem Dissolving Aluminum Mandrel after Electroforming on It (November 24)

Zinc plating on Zamak blisters & peels open Q. (November 22)

• What causes blistering of nickel plated parts? (November 19)

Nickel plating white patches and dullness (November 19)

How to achieve iridescent finish on zinc plated steel (November 18)

• Black chromate on cadmium rubs right off open Q.(November 12)

• Reducing chloride concentration in acid copper bath open Q. (November 9)

• Shelf Life of Tin Electroplate open Q. (November 2)

• "Dot Skip" Problem in Plating of ABS Plastic (February 22) open Q.

• Palladium activation for EN Problems & Solutions (February 22) open Q.

• Problem doing EN on stainless with only non-magnetic plating (February 10)

• Silver plating with silver nitrate open Q. (February 9)

• Nickel Plating with Boron Nitride Particles (January 22)

• Black Stain in blind & threaded holes of electroless nickel plating (January 15)

• Mid Electroless nickel on Brass against an 6000 series Aluminium? open Q. (January 13)

• Solder turns black and takes no Electroless Nickel open Q. (December 7)

• Difference in meaning between: ENIG vs Immersion Gold vs Chemical Gold (December 7)

Chrome plating peels off of electroless nickel (November 25)

• Barrel plating on plastics: EN comes off in copper plating step open Q. (November 24)

• Decomposition/Plate-out of Electroless Nickel Plating Bath (November 20)

Formula for electroless nickel plating solution open Q. (November 19)

White Stains and Unplated areas in EN Plating open Q. (November 16)

• PVD coating on SS wire (August 20)

• How to get white color with PVD? open Q. (July 30)

Rough & lumpy low quality galvanizing (February 22) open Q.

• How do we tolerance and gauge galvanized fasteners? open Q. (February 11)

• Need to build a Hot-Dip Galvanizing Kettle open Q. (February 11)

• Is galvanized steel appropriate for water/glycol mix? open Q. (February 10)

• What degreasing & flux for HDG of lighting poles? (January 26)

Problems & solutions in continuous strip & wire galvanizing open Q. (December 19)

Roughness in Hot Dip Galvanizing Process (December 14)

• Pre-Galvanized Sheet vs. Post-Galvanized Components (November 30)

Re-galvanizing Worn or Partially Galvanized Steel open Q. (November 27)

• Why can't we add pure aluminum to galvanizing kettle? (November 27)

• How do you use wax coating at end of Black oxide process open Q. (February 8)

• How to make black golf putter heads? (January 30)

• Does black oxide add hardness? (January 11)

• Best Alternative to Black Oxide Finishing open Q. (January 5)

• Black oxided stainless fails salt spray, but supplier says it passed when supplied open Q. (November 2)

• How to give steel a dull appearance open Q. (November 1)

• Cost Estimating for S442 Zinc-rich Dip-spin Coatings (February 9)

• Thermal Diffusion Coating Process (September 14)

• Anodizing Tungsten Carbide for Electrical Insulation open Q. (July 23)

Book or notes for PT CED (February 2)

• CED System Issues: Recovering paint, Ultrafiltration problems open Q. (February 1)

Defects in CED Coating open Q. (December 28)

CED coating has pinholes open Q. (December 22)

• CED Paint conductivity is dropping open Q. (November 12)

• Brake caliper coating Q&A: Paint over anodizing & electrocoating? (February 21)

• Surface Treatments For Aluminum Concrete Forms (January 29)

• Powder coating reclaim -- does anybody take recycled waste powder? (January 15)

• Aqua Blasting before Powder Coating open Q. (January 8)

How to Powder Coat Plastics (Nylon, ABS, Polycarbonate, Composites) open Q. (December 30)

• Candy color powder looks great on chrome plating but not on imitation chrome powder open Q. (December 17)

• Is it necessary to wash paintlok prior to powder coating? open Q. (December 10)

• Salt spray life of powder coating mild steel sheet after shot blasting surface treatment (November 27)

• Powder coating onto zinc-iron plating open Q. (November 11)

Applying Colors to Nickel Plating (February 25) open Q.

Clear coating for for exterior steel open Q. (January 22)

Clear coating to seal a rust patina finish on metal (December 14)

• Polymer Coating of Sterling Silver as an Anti-tarnish Treatment open Q. (October 10)

• Paints for power transformers (February 19) open Q.

• Epoxy bleed-out problem on matrix leadframe open Q. (February 8)

• Poor adhesion of paint to aluminum open Q. (January 27)

Plastisol Mixing Formula: Q&A on Improvements open Q. (January 24)

Painting of flexible polyurethane and vinyl objects open Q. (November 10)

• Chromate conversion on cadmium not adhering (February 11)

• Paint is peeling from chromated zinc plating (July 26)

Zinc plating with blue chromate has fat brown stripe (June 19)

• Baked zinc plating vs. zinc without bake (February 12)

• Solderability of tin plate containing intermetallic compounds (November 19)

• Hydrogen embrittlement relief is softening our carburized parts open Q. (October 7)

• Stripping Cadmium plating and choosing a method (February 26)

• Removing TiN (Titanium Nitride) coatings with Oxiclean open Q. (December 23)

• Stripping/removing cadmium plating safely open Q. (December 17)

• Issues Stripping Cadmium with Ammonium Nitrate (December 2)

• Titrimetric procedure for trivalent and hexavalent chromate analysis (February 24)

• Q&As on Operation of ASTM B117 Salt Fog Test Chambers: The Salt Spray Woes open Q. (February 11)

• Wood's Nickel Strike Bath Analysis & Maintenance (February 10)

• Chrome plating thickness determination open Q. (February 9)

• Test for cadmium plating open Q. (January 30)

• Lab sink set-up? How to deal with titration waste? open Q. (January 26)

• Spot check for testing for Sn on Al substrate? (January 26)

Measuring cadmium plating thickness magnetically open Q. (January 18)

Copper vs. stainless "Stress Tabs" for Electroless Nickel open Q. (January 16)

• Salt Spray vs. Humidity Test for Passivated Stainless Steel? open Q. (January 16)

• How to calibrate a pH meter for 0.65 and 1.3 pH range (January 10)

• Zinc plating didn't rust in salt spray test, but got thinner open Q. (November 24)

• Anodizing I.D. (internal diameter) of hollow aluminum tubing (November 20)

• Analysis of HF in Mixed Acid Baths (November 19)

• Analysis of metals and acids in Electropolishing Baths for stainless steel open Q. (November 6)

• Wastewater: big spike in Carbon Disulfide open Q. (February 15)

Biological/Algae Growth in Tin Plating Rinse Tanks (February 11)

• Waste Water Treatment of Silica top coats (January 24)

• Wastewater treatment issue: Turbidity problems open Q. (January 19)

• Removing black from anodizing dye rinse open Q. (December 10)

• Alternative uses for high TDS waste from RO system? open Q. (December 7)

• Need photo of chrome tank with mist suppressant please open Q. (November 9)

Toxic Lead and chrome in coffee makers and espresso machines? open Q. (February 20)

• Plating Tank Disposal -- What Are the Rules (February 18) open Q.

• Sick from drinking citrus juice from a galvanized water jug? (February 12)

• Cadmium and chromate toxicity/safety from aircraft bolts open Q. (February 7)

• Rhodium allergy? open Q. (February 4)

Cause of black mark on skin open Q. (January 21)

• Will heated copper pipe emit cyanide gas or other toxins? (December 4)

• Chromium plated teas strainer scares me ... a lot (November 30)

Can I safely cook my Turkey in galvanized trash can? (November 30)

• Iridium Coated Titanium Anodes: Sources, Anticipated Life, Applications (February 25)

• Plastisol coating of plating racks? How / where? (February 18)

• Flow meters to be used in Tin Electroplating line (February 9)

• Looking to purchase a small zinc electroplating system (January 29)

• Cleaning/leaching a plating tank (January 19)

Corroded Titanium Anode Baskets in Plating Tank (January 14)

• Scale Buildup in Drain Lines of black oxide and aluminum etch open Q. (January 10)

• Barrel plating : long workpiece / nail/spike/screw open Q. (December 22)

• Uses for Graphite Anodes? (December 2)

• Push manifold for open surface tanks (plating shop) (November 5)

• Overview table of plating and its properties (February 21) open Q.

• Looking for a breakdown of spec.: STD3947, Fe/Zn-Fe8c4 open Q. (February 4)

• Is Nickel Strike allowed before Cadmium plating heat treated bearing steel? (January 14)

Where to find Dr. Alec Watson's paper on Nickel Sulphamate plating (January 12)

• Anodized Aluminum Coating Weight Testing ASTM B137 open Q. (January 8)

Metal Finishing Guidebook -- How to Get It? (November 23)

• Stress relief & de-embrittlement baking when hardness of parts varies? open Q. (November 19)

• What does Surface Current Density mean? (July 30)

• What is this mystery "electroplating over paint" process? (July 24)

• Substitute for nitric acid to strip zincate off aluminum open Q. (December 30) 2nd Request

• Substitute for chrome plating open Q. (December 26)

• Understanding MIL-C-5541 Type 1 Class 1A & 3, and Type 2 Class 1a & 3 (December 15)

• Electroformed Nickel Bellows Annealing Process (February 23) open Q.

• Hardening EN8 & EN9 parts (February 18) open Q.

• Can Powder Coating Affect Heat Treatment or Weaken Aluminum? open Q. (January 12)

• Low temperature impact on 304L permeability open Q. (December 1)

• Aluminum temper T6 vs. T66 open Q. (November 6)

• Refining of Palladium and making its salt (February 19) open Q.

Melt old gold to make new jewelry open Q. (January 22)

• Cleaning gold that has been burned open Q. (December 14)

• Separate gold, silver, and platinum from each other open Q. (October 22)

• How to make Pewter Shiny? (February 26)

Re-anodizing Aluminum (February 25) open Q.

• Need Dupont Lucite Acrylic Lacquer paint (February 25)

Replating of barber chairs (February 23)

• F.B. Rogers Tea Set -- Is It Silver Plate or Sterling Silver? (February 23)

• Silver Plating turning pink (February 23) open Q.

• What chemical will heat water to melt ice? (February 22) open Q.

Cast Iron Cook Stoves: Where to find parts and how to restore (February 21)

Can't remove wheels from antique baby carriage (February 21) open Q.

• How to Fix mercury damage to gold jewelry (February 20)

• Need relining/re-tinning of copper pots & pans -- or tell me how to (February 20) open Q.

• Electroforming Jewelry but the Stones Got Covered (February 19) open Q.

• Remove rust with muriatic acid (HCl / hydrochloric acid) (February 17) open Q.

• Gluing to Polypropylene? (February 17)

• Removal of clearcoat on copper (February 15)

Trying to make Nickel Acetate D-I-Y (February 14)

• Restore/repair black porcelain sink finish (February 8)

• Antique icebox Q&A's, Problems & Solutions (February 4)

• Do It Yourself Nickel Plating onto Steel (February 5)

Dyed Anodizing Color Matching Q&A, Problems & Solutions open Q. (February 1)

Paint removal in corners of wood door (February 1)

Help, my yellow brass turned pink (February 1)

• Copper Plating from an Ammonia Solution (January 31)

• Preparing acid copper brightener (January 30)

Zincate formulas for plating on aluminum open Q. (January 30)

Can I do 'rusting process' on nickel plated items? open Q. (January 27)

Removing tarnish on brass & copper open Q. (January 27)`

Zinc electroplating for hobbyists and school projects open Q.(January 26)

Restoring rusty cast iron wood stove, painting or polishing it (January 23)

How to fix pewter that turned gold color open Q. (January 20)

Can I rubber line a bottle cooler? (January 20)

• Lacquering / clear coating a Brass Bed (January 18)

Home Anodizing (January 18)

• Boiling water seal for home anodizing? open Q. (January 18)

• High strength fastener Q&A's, Issues & Answers open Q. (January 16)

• Paint/powder coat Aluminum Wheelchair Q&A's (January 14)

• Stripping a faucet down to raw brass open Q. (January 13)

How to clean Birds in Flight metal sculpture open Q. (January 13)

• Pre-coating for sublimation transfers onto ceramic (January 11)

• How to electroplate Aluminum onto Aluminum (January 10)

• Yellow Chromate Adhesion Problem (January 6)

• Rash from Ring? Fixed by Boiling in Vinegar & Peroxide! (January 5)

• Demi-fine gold plating of jewelry open Q. (January 5)

Restoring the dark brown finish to copper sinks (January 4)

• How to Blue / Blacken Brass open Q. (January 3)

• CLR ruined my baking pan (December 31)

• Re-anodizing Aluminum which has been previously anodized open Q. (December 30)

• Bathroom faucets corrode away from the inside (December 22)

• Confused about "acid test" for silver and other precious metals open Q. (December 21)

Electrolytic cleaning plates for silver: Q&A (December 19)

Jewelry plating problems for hobbyists, designers, startups open Q. (December 18)

What finish is on this antique turn signal actuator? (December 16)

• Want to do matte silver finish "french dead silvering" on brass clock dial open Q. (December 15)

• How to Clean Brass and Prevent Tarnishing open Q. (December 15)

• Preserving heat coloring of copper when clear coating (December 15)

• Q&A's about 'Memory Wire' in Jewelry (December 15)

• Hardness of black chrome finish for handgun? open Q. (December 10)

How to refinish cast iron and cast bronze fireplace surrounds open Q. (December 10)

• How to clean/restore old brass or bronze portholes open Q. (December 9)

• Annealing mixed metal jewelry (copper & silver) open Q. (December 7)

• Can you plate over yellow zinc with clear/silver? (December 7)

• Remove rust spots from manganese phosphate (December 5)

• Teak oil dries unevenly -- some spots are too dry (December 1)

• How to make Zinc Chloride (February 21) open Q.

• Electroforming of Copper Foil open Q. (January 10)

• Teflon coating of stainless steel open Q. (January 2)

• Want High Residual Stress in Electroless Nickel (December 2)

• Selective passivation of Iridium edges open Q. (November 28)

Science Project: White Precipitate in Copper Plating? (February 22) open Q.

• Science project on the effect of SALT & WATER on steel wool (February 4)

• Which Beverage cleans pennies best? (December 15)

• Electroplating copper from copper sulfate bath for science project (December 7)

• Maple Syrup Boiling / Evaporator Pans (February 25) open Q.

Hanson Van-Winkle Munning (H-VW-M) memories & memorabilia (February 18)

Fix frozen zipper stuck from salt spray or corrosion (January 12)

• Mill Scale Uses and Applications open Q. (January 5)

Can't disassemble Stiffel lamp socket open Q. (January 2)

Residential Elevators Parts and Maintenance open Q. (December 30)

• Zinc oxide production by French process open Q. (December 24)

Problems in White phenyl Manufacturing open Q. (November 21)