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 0. Choosing a Finish (corrosion, compatibility)
  1. Preparing the part (mech. prepchem. pretreatmasking & racking)
    2. Metallic Finishing (stainless & titaniumanodizing & light metalselectroplatingelectroless platingPVD & vacuum processesgalvanizingbluingother inorganic processes)
      3. Organic Finishing (CED, electrocoatpowder coatinglacquers, clearcoatspainting, printing, adhesives)
        4. Post-treatments (chemical post-treatsbaking, soldering, dryingstripping & reworks)
          5. Supporting Issues (analysis, lab, QA/QCwater & wastesafety, emissionsplant/process engrg.specs, books, statslingometallurgyprecious metal recovery)

            6. NON-industrial (hobbyists, DIY, around homeresearch, thesisK-12 scienceArtists' Corner)
              7. NOT Metal Finishing (off topic but interesting)

   Read any thread & add your Q/A or Post a Question or RFQ of your own


0. CORROSION, COMPATIBILITY, CHOOSING A FINISH . . .

• Coloring Nickel Plating, like red or blue open Q. - January 26

• Better corrosion resistance: zinc plating or zinc phosphating? - December 19

61503-1i Matte black finish for mild steel rivets - December 11

31503-2i Galvanic Corrosion between nickel & aluminum open Q. - November 26

• Want black bolts with no oil on them - November 21

• Black finishes for bolts and hardware Q&A - November 17

• Copper weathervane staining aluminum church steeple open Q. - October 26

• SPCC vs. SGCC vs. SECC steel for computer cases open Q. - October 20

• Galvanic Corrosion between Galvanized Steel and Aluminum - October 19

See more threads in this category



1. PREPARATION . . .

1a. MECHANICAL PREP [GRINDING, POLISHING, VIBRATORY FINISHING, BUFFING, HONING]

• Difference between Ra and Rc - surface roughness - January 26

• Cracks in hard chromium platings not visible, but are deep in NDT open Q. - January 10

• Mechanical finishing of body jewelry and wires open Q. - December 25

• Surface finishes N1 thru N12 and their equivalents in Ra - November 27

• Polishing chromoly chandelier - October 30

• Grinding HVOF coatings open Q. - August 14

• Formula for polishing and buffing compounds - July 16

See more threads in this category


1b. PRETREATMENTS [CLEANING, PICKLING, ETCHING, PHOSPHATIZING, ACTIVATION]

• Zinc Phosphate coating problems & issues; Q&A's - February 4

• Want good salt spray hours from phosphating without oil - January 31

• Pickling & passivating of welded carbon steel pipe open Q. - January 19

• Need details of 'the 7-tank process - January 16

• Coating Weight Specs. How to increase/decrease zinc phosphate coating weight - January 4

34052-5i Manganese Phosphate coating is uneven, non uniform open Q. - November 26

• Remove rust with muriatic acid (HCl / hydrochloric acid) open Q. - November 23

• Manganese phosphate coating: issues and answers open Q. - November 8

• History of Parco-lubrite, zinc phosphate, and manganese phosphate coatings open Q. - November 1

• Etching of Tungsten Problems & Solutions Q&A - October 31

• Need Pickle Inhibitors, Rodine and alternatives - October 26

See more threads in this category


1c. MASKING, RACKING, TAPING, PLUGGING, PHOTOSENSITIVE MASKS

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• Need TURCO 5580-G masking product RFQ Connecticut - January 12

• How to selectively patina copper (darken it) - November 14

• Masking material / method for electroless nickel plating open Q. - July 25

• Etching problems with PCB tin resist open Q. - July 18

• How to mask glass bangles for PVD coating open Q. - June 18

See more threads in this category



2. METALLIC & INORGANIC FINISHING . . .

2a. STAINLESS STEEL & TITANIUM PROCESSING

• Electropolishing/deburring of hypodermic needles - January 10

• Stainless steel laser etch and passivation Q&A - January 10

5089-1i Removal of Heat Treat Scale from Stainless Steel open Q. - December 13

• Anodizing titanium black in color - December 8

• Haziness or Cloudiness on Type III Anodized Titanium - December 2

• Passivating long small dia., 316L SS tubing - December 1

• Aesthetic thermal browning of stainless steel open Q. - November 28

• Stainless Steel Discoloration when Heat Treating open Q. - November 26

49030-2i Electrochemical De-burring/Grinding of Micro Surgical Knife - November 21

electropolishing problem 55467-4i Electropolishing defect in small area open Q. - November 17

• Anodizing titanium to green color -- electrolytic pre-etch open Q. - November 14

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2b. ANODIZING AND LIGHT METAL TREATMENTS (Aluminum, Magnesium)

• Roller for adhesion test for chromate conversion coating - January 31

• Need black anodizing that is UV-proof open Q. - January 29

• Bending aluminum: best alloys and lubricants open Q. - January 19

• Aluminum anodizing: Constant current vs. controlling the voltage - January 11

• Thickness of Alodine/Iridite/Chemfilm on Aluminum - January 3

• MIL-DTL-5541 Chem film fails humidity test - January 2

• Burning problem in Hard Anodizing of Aluminum open Q. - January 1

• Anodising thickness not being achieved - December 31

4422-3i Aluminum Anodizing Color Match Problems - December 22

30670-2i Anodizing Discolorization "Leopard Spots" - December 21

• MIL-C5541-Class 3 Question - December 20

22258-4i Chromic Acid Anodizing: Parts are too dark open Q. - December 17

56407-1i Stains in Electrocolouring of aluminum - December 6

See more threads in this category


  

2c. ELECTROPLATING and ELECTROFORMING

• What Part Does Voltage Play in Electroplating? - February 4

• Hard Chrome Plating Failures on Hydraulic Cylinders open Q. - February 4

• Gold isn't bright when plating leaded stained glass - February 3

• Peeling problem in reel to reel plating open Q. - February 3

18361i What is the Corrosion Life of Nickel Plated Components? - February 3

• Nickel plated stainless steel batteries getting pinholes open Q. - January 30

• Tin plating: how to improve Salt Spray hours? - January 29

• Gold plating rubs right off! - January 28

28851-9i Very large black rack marks in Zinc-Nickel Plating - January 26

• Alkaline Zinc Plating Q&A's, Problems & Solutions - January 26

• Plating time too long (acid zinc) - January 16

• Heavy parts chrome plate well; light ones don't open Q. - January 16

• Nickel plating Inconel Q&A: Bumps in low-stress nickel - January 14

61510-1i Silver plating delaminates from copper parts but not brass parts - January 10

• Relationship of Plating Thickness to Current/Amperage - January 10

• ISO a Metal Plater with loooooooooong tanks! 2nd Rqst, open to all RFQ South Florida - January 7

35342-4i Why is chromium failing? - December 25

61500-1i DI water stains Nickel plated surface open Q. - December 23

• Nickel and Gold Plating onto Bronze Workpiece 2nd Rqst - December 19

• Nickel Electroplating is peeling off Stainless Steel - December 19

• RoHS Zinc Plating of Machine fasteners and Bolts - December 14

• Electroforming onto silicone forms/mandrels open Q. - December 12

• Zinc Plating / Electrogalvanizing Mild Steel Wire - December 12

See more threads in this category


2d. ELECTROLESS PLATING, PLATING ON PLASTICS, IMMERSION PLATING, CHROME-LOOK SPRAYS, LIQUID METAL COATINGS

• Spray chroming with silver nitrate - January 3

• Can citric acid passivate a stainless tank used for electroless nickel plating? - October 26

• Palladium activation & Plating on Plastic - October 1

• Heat treatment of Electroless Nickel Plating open Q. - September 23

• Electroless gold plating (autocatalytic) open Q. - September 18

• Composite electroless nickel-PTFE plating open Q. - September 13

• Electroless Nickel Plating of Aluminum without Zincate - September 9

• Barrel plating on plastics/ABS - September 5

• A method for electroless brass plating? - September 3

• Need help with electroless/immersion tin plating open Q. - August 21

• Electroless nickel-boron plating open Q. - August 9

See more threads in this category



2e. PVD, CVD, ION IMPLANTATION, VACUUM PROCESSES

7846-4i PVD coatings: color control open Q. - December 7

• Need base coats and top coats for vacuum metallizing RFQ South Africa - November 20

• How to make glass in colors? open Q. - November 15

• How to get Black PVD finish open Q. - September 2

• Masking in PVD process open Q. - March 25

• Need to patch up the leakage in vacuum chamber open Q. - March 22

50847-1i Diamond Like Carbon (DLC) Coating Coming Off After Steam Autoclave - March 16



2f. GALVANIZING, ALUMINIZING, HOT TIN DIPPING

57163-7i Galvanizing defects: black spots, lumps, streaks - February 5

hot dip galvanizing black spots Hot dip galvanizing flux Q & A's - February 4

• Hand re-tinning of copper cooking utensils? open Q. - January 31

• Safety in a Zinc hot-dip galvanizing process open Q. - January 26

• Want pre-galvanized sheet with 720 hours salt spray resistance - January 19

• Can stainless steel be hot dip galvanized? open Q. - January 9

• Galvanizing flux bath has iron contamination - January 8

• Required Frequency of Zinc Dross Removal - December 30

• Sink roll in hot dip galvanized strip problems - December 20

• Hot-Dip Galvanizing Kettle: how to build or where to buy one RFQ - December 9

56867-11i Black/Gray Staining on Batch HDG - November 15

• Temporarily weld/repair Galvanizing Kettle - September 21

• How to detect whether powder coating is on GI vs CRCA? - September 20

• Galvanizing flux bath has low pH & high iron - August 31

41367-1i Zinc consumption control in hot dip galvanizing - August 31

• How to reduce bottom dross in hot dip galvanizing line? open Q. - August 31

See more threads in this category



2g. BLACK OXIDE, BLUING, COLORING, PATINAS, NITRIDING

• Blackening formulas for steel and cast iron - January 2

• How to do smut-free mid temp black oxide on wood screws - December 25

• Black Ox problems due to lot variations in type 300 SS? - December 20

• Black Oxide Coating Thickness - November 18

• Which oil BLACK OXIDE finish? open Q. - October 2

• Black oxide is salmon colored. Is copper the problem? - September 19

• Cold blackening on SS turns blue over time open Q. - September 6

• Mid temperature blackening smut issue open Q. - June 13

61453-1i Rust on black oxide parts open Q. - June 12

• Black oxide problems on 4340 steel open Q. - May 13

• Steam Homo Treatment vs Black Oxide Treatment - April 6

• Black oxiding of hardened steel is brown open Q. - March 3



2h. OTHER INORGANIC FINISHING: Mechanical Plating, QPQ, Metal Spray, Zinc-rich Dip-Spin Coatings, Sherardizing, etc.



3. ORGANIC FINISHING [PAINT, POWDER COATING] . . .

3a. ELECTROPAINT PRIMING, AUTOPHORETIC COATINGS

• E-coating on anodized aluminum? - December 8

• Low pH Problem & Dropping Anolyte Level in CED Bath - December 1

61499-1i Excessive foam formation in UF1 dip tank open Q. - November 23

• How to perform Acid MEQ of CED Bath manually? open Q. - November 3

45618-1i E-coating over Zinc or Zinc Cobalt Plating -- Problems & Solutions - September 27

• Water spots & water or paint flow marks after curing - July 16

32574-9i Chalky, ashy CED (cathodic electrodeposition) coating - July 12

• Need CED coating service in Chennai RFQ Chennai India - June 16

• Random adhesion failure in Electrodeposition coating open Q. - April 15



3b. POWDER COATING

• Chromated & Powder coated ADC12 Aluminum doesn't pass 366-hour salt spray test open Q. - January 31

• Industry specs for powder coating thickness and testing methods? open Q. - January 9

• Sublimation heat transfer paper for powder coating? open Q. - November 15

50530-2i Powder coating burns during cutting & slotting of profiles - September 18

• Blisters/ Peeling of Powder Coating on Zinc Plating open Q. - June 23

• Powder Coating Galvanized Steel open Q. - May 17

1618-1i Necessity for primer with powder coatings? open Q. - April 19

• How to prevent corrosion of dully powder coated CRCA panels from acid fumes? - March 29



3c. LACQUERS, CLEAR COATS, ELECTROPHORETIC TINTING, ANTI-TARNISH

• Clear coating silicon bronze open Q. - September 27

• How to make long lasting Dye Gold Plating on Imitation Jewelry open Q. - September 5

• Clearcoat for polished brass & copper bathtubs open Q. - June 27

45328-1i Water spot problem in CED open Q. - April 4



3d. PAINTING, PRINTING, ADHESIVES AND OTHER ORGANIC COATINGS

15909-2i Plastisol stays sticky after curing open Q. - December 12

• Solar Heat Reflective Paint Consultant RFQ London U.K. - December 6

• Q&A on MIL-P-23377 primer - December 6

• Scratch marks are appearing in ABS Parts after painting open Q. - October 2

35114-1i Can You Paint a Car with House Paint? - September 16

• PVC Insulation Coating Blackens Copper Wire & Cable open Q. - August 21

• Help, paint adhesion problem on HDPE open Q. - August 20

• Repairing damaged PVDF Coating open Q. - July 29

• How to make wrinkle paint open Q. - July 20

• Sublimation coating formula for ceramic mugs - July 16

• Need custom tins for liquor company RFQ Jacksonville FL - July 2

31579-1i Eliminate Pin Holes on Painted Wheels open Q. - June 27

See more threads in this category



4. POST-TREATMENTS

4a. CHEMICAL POST-TREATMENTS [CHROMATE CONVERSION COATINGS, RUST PREVENTATIVES, PATINAS, COLORIZING]

• Post-dip to improve color of imitation gold plating? - December 20

• Help with dye over zinc plating - December 2

• Yellow/gold Iridite leached to clear - October 12

• Answer to why Black Chromate turns green - July 15

• Is Zinc Plating with Chromate Conversion Coating RoHS compliant? open Q. - July 9

• Chromate conversion on cadmium not adhering open Q. - March 23

• Generic solution for chromating brass - March 22

• Bright Dipping of Brass: some shop problems open Q. - March 20



4b. BAKING AND NON-CHEMICAL POST-TREATMENTS [HYDROGEN EMBRITTLEMENT AND DE-EMBRITTLEMENT, ANNEALING, WHISKERS, SOLDERING, REFLOWING]

• Matte tin turns into bright with reflow open Q. - January 12

45934i Are tiny solid blobs of tin detrimental to PCB? open Q. - January 4

• Hydrogen Embrittlement and the Lawrence Gauge - November 16

• Chrome plating and Hydrogen Embrittlement Relief - September 9

• How to improve the solderability of tin electroplating? open Q. - July 16



4c. STRIPPING, REWORKS, ETC.

adv. metalx

• Stripping Tin / tinplate from Steel open Q. - November 18

• Can sulfuric acid be used to remove nickel plating from aluminum? open Q. - October 26

• What to use as anodize remover/stripper open Q. - October 14

• How to strip chromate from silver plated finish - October 14

11955-4i Can't strip chrome from copper gravure cylinder open Q. - October 3

• Removing rhodium plating electrolytically - September 8

11499-1i Removing TiN (Titanium Nitride) coatings - August 19

See more threads in this category



5. SUPPORTING ISSUES

5a. ANALYSIS, LAB TECHNIQUE, Q.A., SALT SPRAY TESTING

• Taber ASTM D 4060: conditioning aluminum coupons open Q. - February 4

• Fluoride analysis in HF/Nitric (etch for titanium) - January 30

• Maintaining and Monitoring Acid Copper brighteners open Q. - January 17

• Analyze for iron content in hydrochloric acid - January 4

• Analysis of Nitric Acid in the presence of Hydrofluoric Acid open Q. - December 13

• ASTM B117 Salt Fog Test Chamber Operational Q&As, Problems: Salt Spray Woes - December 7

• MIL-DTL-5541 Chromate Conductivity Testing - November 27

• Analyze tin metal left in electroless tin solution open Q. - November 2

• Test if Alodine 1200 clear was actually done - October 17

• Determine % Nitric Acid. Titration? - September 29

• How to Analyze Resin Impregnation of Aluminum open Q. - August 14

• Distilled water good enough for analysis? - August 14

See more threads in this category



5b. WASTE & WASTEWATER TREATMENT, POLLUTION CONTROL

• Recovery of copper from electroplating & etching solutions open Q. - January 19

• Recycling of Chrome Stripping solution (HCl) - December 30

• DM System Problem: Poor OBR, short SBA life open Q. - November 20

• TDS vs PPM vs. µS? - October 14

• Trivalent Chromium vs. Hexavalent -- what are the differences? - August 31

• Recycling of chrome sludge open Q. - August 14

• Ferrous Chloride vs. Ferric Chloride for reducing H2S levels open Q. - August 6

61445-1i Defects on test panel left in the water - June 2

• Can Trivalent Chromium degrade into Hexavalent Chromium? - May 3

• Dangers of drinking deionized water open Q. - April 19

• Methods for pH measurement in D.I. water - April 15



5c. SAFETY ISSUES, EMISSIONS, TOXICITY, ENVIRONMENTAL IMPACTS

• Is worn silverware a Health Hazard open Q. - February 2

• Does my silver plated flatware contain lead? open Q. - January 16

• Sick from welding galvanized steel - January 16

• Danger in Cast aluminum cookware? open Q. - December 5

11353-3i Yellow zinc hex nuts in arts and crafts projects - November 28

• Safety of hibachi barbecue with yellow zinc screws and damper open Q. - September 22

• Permit requirements for powdercoating - September 13

• PTFE/Teflon Environmental Concerns - September 6

• Boric Acid as Eye Wash open Q. - August 31

• Mixed bleach with acid and inhaled it - August 14

• Safety of Galvanized Steel in home-made DIY smokehouse - July 16

See more threads in this category



5d. PLANT & PROCESS ENGINEERING, CONSTRUCTION

• Titanium anode baskets get copper buildup in Rochelle Copper Plating - February 3

• Need design assistance on French process zinc oxide furnace So. Africa - January 16

• Avoiding Tank Overflows in Plating Shop - January 13

• How to prevent contamination of Nickel Strike by copper from bus bars? - - January 1

• 2% Sulphuric Acid in 316SS tank is turning green & smutty during Aluminium pickling - November 15

• Best way to remove lining from Chrome tank - October 14

• Need Anode Baskets for Silver Plating RFQ Watertown TN - September 7

• Materials of construction for pump for zinc phosphate - July 18

• Looking for small custom titanium anode baskets RFQ Guatamala - June 7

• Sludge buildup in phosphating piping - June 3

• Heating/cooling coil material for chrome plating - May 20

• Sodium hypochlorite (bleach) piping problems - May 19

• Maximum safe watt density for zinc plating solution heating - May 10

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5e. QUESTIONS ABOUT SOFTWARE, SPECS, BOOKS, EDUCATION, INDUSTRY STATS, ETC.

• International standards for phosphating processes open Q. - February 4

• BAC 5709 and Opening Oven Door to Load More Parts open Q. - December 12

• MIL-DTL-5541 Class 1A vs. Class 3 - October 8

• Phosphatizing standards -- MIL-DTL-16232 - August 9

• Is MIL-PRF-23377 equivalent to BMS10-11? open Q. - August 4

• Meaning of plating spec abbreviation MFzn8S open Q. - June 12

• How to Make Artificial Sweat and Conduct Testing? open Q. - June 2

• Swedish Standard St2 / St3 open Q. - May 2

• MIL-C-5541: Will It Work On Copper - April 13

• Cadmium Plating spec QQ-P-416 and clear chromate - March 23



5f. W...W...W...WORD OF THE WEEK

• Is there such thing as sterling silver plating? open Q. - August 30

• How Did Kitchen Zinc become Sink? open Q. - June 26

• Definition of "passivated" in regards to metal finishing, plating, and stainless steel - March 13



5g. MOSTLY METALLURGY; Heat Treatment

• Problems in Annealing of Copper Wire open Q. - January 26

• Is 6063 aluminum a precipitation hardening alloy? open Q. - January 11

• 316L Stainless is too spring-y - January 3

• How to decarbonize the surface of high carbon steel - December 22

• Does forging create mill scale? open Q. - September 8

• Hardening EN8 / EN9 parts open Q. - August 10

• Hardening EN8 / EN9 parts. Q&A's, Problems & Solutions open Q. - April 1



5h. PRECIOUS METAL RECOVERY

• Specific gravity table for gold open Q. - January 16

43983-7i Is this ore/rock Platinum, Palladium & Rhodium? open Q. - December 11

27814-3i Why is broken catalytic converter honeycomb worthless as scrap? open Q. - November 10

• Refining of silver chloride to silver metal open Q. - July 28

• Refining of Palladium and making its salt open Q. - July 16

• How to precipitate gold from HAuCl4 solution open Q. - July 12

• Best and Easiest way to refine gold dust open Q. - April 21

• Extracting Silver From Photographic Fixer open Q. - April 18

• Recovery from AP waste solution open Q. - March 8

• Strip and recover silver from silver plated tableware open Q. - March 8



6. NON-INDUSTRIAL ISSUES

Hobbyists, DIY, Around Home

• Clear coating to protect rust patina finish - February 2

• Carburetor re-plating / re-coloring open Q. - January 30

41407-3i Magnetic, silver-color, 1998 penny open Q. - January 30

• Removing Teflon non-stick coating from Glass Cookware open Q. - January 26

41066-8i Dishwasher ruined shiny aluminum - January 26

• Restoring the yellow dichromate finish on automobile carburetors open Q. - January 20

• D-I-Y Yellow gold engagement ring to white gold? open Q. - January 20

• Solving an electrolysis problem in home plumbing open Q. - January 18

• Acid copper plating is not responding to brightener open Q. - January 18

• Chrome redipping for wheel open Q. - January 16

• Copper plating of lead bullets, cheap & simple open Q. - January 14

• Chemical removal/stripping of chrome from bicycle parts open Q. - January 11

• Karat gold (10k-18k) electroplating using dissolving donor anode open Q. - January 11

19382-1i Making aluminum look like copper - January 10

• Where to find ZAP professional restorer open Q. - January 9

• Which metal is safest for fireplace heat exchanger? open Q. - January 9

• How To Rust Metal like Jingle Bells & Safety Pins - January 6

61509i Sealing lightly corroded aluminum engine parts with crude oil open Q. - January 4

• Painting a car with house paint open Q. - January 2

50888-7i Damaged finish on copper table open Q. - January 1

60503-2i Penny Floor Problems & Solutions - January 1

32469-1i Is black Hard Chrome as hard as White? open Q. - December 26

32986-2i How to make polyresin coated real flowers - December 25

• Thru-hull fitting w/brass hose barb & bronze valve open Q. - December 24

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6b. RESEARCH, THESIS TOPICS, UNIVERSITY & POST-GRAD STUDENTS

• Electroless Nickel: need intro and technical info - January 31

• Electrodeposition of titanium remains a bust :-( - October 28

• Procedure for electropolishing stainless steel - October 26

• Silver paste on PZT blisters after firing open Q. - October 12

Copper Plating on Sputtered Gold Electroplating Copper onto PVD/Sputtered Gold Substrate - September 8

61452-1i Recovery of Metallic Magnesium from Magnesium Citrate. Is It Possible? - June 13

• Electrolytic Passivation of Nickel Plating - June 7

• Electroplating on 3D Printed & Stereolithography (SLA) models open Q. - June 6

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6c. K-12 Science Projects, Grammar & High School Student Questions

• Why does tarnished penny weigh less than shiny one - January 28

• Science project: To rust and trust - January 6

• Copper sulphate reaction with a nail or steel wool - November 11

• Rusting in distilled water vs. saltwater - October 3

• Why can't we store electricity in water? - June 14

• How many mL of water must be added to 10 grams of NaOH to make a 0.50 molar solution? Thanks! Resolved :-) - May 23



6d. The Artists' Corner

• Can print maker prevent ink discoloration on etching plates? open Q. - December 6

53936-1i Long ridges on copper electroform - October 17

C. Curtis metal sculpture How to clean/repair C. Curtis metal sculpture open Q. - September 7

61479-1i Can't restore bright finish to bare aluminum piece - September 1

41408-8i Painting cast iron fountains / restoring rusty fountains - August 9

• Archival painting on brass and copper open Q. - July 29

red spots when bronze casting Dark Reddish Spots when Bronze Casting - June 7

61446-1i What do black spots on aluminum sculpture tell art student? - May 25

61430-1i Strange reaction of copper BB on a bronze sculpture - May 2

47701-1i Protecting Metal Birds in the Tropics - April 23



7. DRIFTED OFF FINISHING, BUT INTERESTING :-)

• Barber Chair Restoration Q&A's and Successes open Q. - February 3

54890-5i Theda Sterling Silver Medals, Crosses, Jewelry Q&A - January 11

10153-2i Sedgwick Residential Elevators Parts and Maintenance open Q. - January 10

19039-23i Cook Stoves: Where to find parts and how to restore - January 7

33151i Looking for a Magnet That Attracts Gold - January 5

32413-1i About sweet spirits of nitre - December 31

0757-3i National Cash Registers: How to Restore & Refinish - December 20

29370-32i Identifying rings and hallmarks: "Haven"? open Q. - December 17

• Ribbon Speakers: Where to find conductive paint / epoxy, ribbons? open Q. - December 7

31934i How did copper protect ships against WWII attacks? open Q. - November 27

25827-3i Remove plastic film (& adhesive) from stainless steel, brass? open Q. - October 17

• Copper Sulphate as Swimming Pool Algae Remedy? open Q. - October 14

61489-1i "Living locket" -- any info available? Lock of hair keepsake - September 29

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