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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 processesgalvanizingbluing/black oxideother 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, around homeresearch, thesisK-12 scienceArtists' Corner)
              7. Off topic but interesting

   or Post a Question or RFQ


0. Choosing a finish, corrosion

16945. Corten Steel -- Q&A, Applications, Problems - July 5

61679. Blackening Hot Dip Gal/Bright Zinc Parts - June 28

61629. Which coating is suitable to 1440 hrs SST - June 20

42140. Connecting aluminum: Stainless or zinc plated screws? - May 27

16063. Zinc hinges for lockers at salt water pool - May 25

61630. Options for using tin plated terminals above the rated temperature? - May 21

61670. 61670-1i Trying to match cast aluminum valve cover finish - May 16

61665. GI vs. CRCA for Office Metal Furniture - April 27

19766. Galvanic Action between Galvanized and Stainless Steel? - February 8

37526. 37526-4i Want gold colored finishes without use of gold - February 5

20345. Salt spray or CASS hours for electrophoretic lacquer on PVD on nickel plating - January 24

16945. Need to know steel mill that produces Corten Steel - January 10

61618. 616181i White flow marks caused by new PT line - January 5

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1. Preparation

1a. MECH PREP topics: "Grinding, polishing, vibratory finishing, buffing, honing"

61675. Aluminum Panel is Mottled after sanding, buffing, waxing - May 27

  5396. Ra surface finish -- is it microinch or micrometer - May 16

29744. Is Abrasive Cleaning Needed for Proper Zinc-Nickel Plating Adhesion? - May 7

38491. Microfinish comparator finishes, visual roughness guide - April 25

  6053. Stainless steel vibratory finishing Q&A - March 1

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1b. CHEM PREP topics: "Cleaning, pickling, etching, phosphatizing, activation"

61681. Phosphating of Nickel Zinc electroplating vipInquirer often helps others, so especially deserves our help - July 15

16827. Zinc Phosphating: Improving the Formula - July 2

37409. Zinc Phosphate Tank Turnovers - July 1

56325. Removing carbon layer from mild steel - May 21

48600. Phosphating: Can't dissolve zinc oxide in phosphoric acid - April 28

168/27. Zinc Phosphating: Improving the Formula - April 23

34052. Manganese phosphate coating: issues and answers - April 22

15596. Rinsing a Cleaner that contains Sodium metasilicate - April 5

61654. Manganese (II) Oxide and manganese phosphate coating - March 27

61650. Testing the concentration of titanium phosphate bath - March 20

61646. Dry Acid salt for brass and Zamak parts - March 3

61599. Zinc phosphate coating is black and peels off - February 5

56325. Removing carbon layer from mild steel - February 2

61625. Electrocleaning of Nickel - January 4

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1c. Capping, plugging, masking, taping


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61590. Masking/Stop off for anodizing on complex parts - January 24

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2. Metallic & inorganic finishes

2a. STAINLESS, TITANIUM, CORROSION-RESISTANT METALS PROCESSING

47682. White patches after electropolishing cobalt chromium material - July 15

  5358. Algae, fungus, bio-fouling in plating tanks? - July 4

  5422. 5422-7i Alcohol Is Making Electropolished Stainless Steel Peel - May 30

61669. 61669-1i SS430 Wire Has Black Spots. Why? - May 20

61668. 304 steel continuously generates dark residue - May 20

20840. 303 Stainless Steel Passivation Problems - April 15

14182. 14182-1i Frosted, etched, or burnt passivated parts - Type 303 stainless steel - April 14

51990. Parts turn black in Wood's Nickel Strike - March 21

11047. Should electropolishing voltage/amperage be ramped? - March 21

61643. Must welding tint be removed before passivation - March 7

26187. Stainless tank with NaOH at 360 °C at 128 bar - February 27

47682. Electropolishing and Chemical Etching Processes for Cobalt Chromium - February 5

14697. 14697-2i Chatter-like marks after electropolishing? - February 2

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

30512. Best Sulphuric Acid Concentration & Influence on 720 Rule - July 15

61674. 61674-1i Some Black Anodizing Came Out Blue - July 4

61239. Dye keeps flaking off along with some of the anodize - July 1

14851. Salt Spray Results vs. Panel Preparation - June 19

56581. Rainbow effect / defect on anodized aluminum? - June 15

  1594. Eliminate stray currents in stainless seal tank - June 5

36556. Coatings on Aluminum for Electrical Insulation - June 4

61653. Shot Peening & Anodization to Maximize Fatigue & Corrosion Resistance of 6082-T6 - May 30

44778. 44778-7i Hard Anodizing Defects: stains on brand new Kawasaki forks - May 27

616/73. Brite Dip & Anodizing on sandblasted aluminium shows white spots/blooms - May 25

61656. DI Water is Etching Anodized Aluminum in the Cleaning Line - May 20

  9519. Plating on Aluminum Q&A - May 3

61664. 61664-1i Magnesium corrosion with TCP treatment - May 3

41531. Cleaning anodized parts with acetone and ultrasonics stains them - April 14

48664. Wet Tape Adhesion Test per MIL-DTL-5541 - April 3

37317. Hexavalent chrome in surface of chromic acid anodized parts - March 21

61636. 61636-1i Black Marks on Extruded Aluminum I-Beams - March 20

  9142. High Thermal Emissivity for Aluminum Electronics Boxes - March 19

34822. Temperature limit for chromate conversion coating on aluminum - March 19

56977. Mirror polishing thin aluminum sheet on both sides without warping - March 10

26894. Problems in cold sealing of anodized aluminum - March 2

61637. 61637-1i Halo spot in Hard Coating 6061-T6 Aluminum - February 22

43248. Two-step" black anodizing has reddish powder on it - February 19

61626. 61626-1i Trouble with Iridite 14-2 only on 2024 - February 19

61639. 61639-1i White patches only when anodizing 60xx - February 19

51573. 51573-1 Hard anodizing chiller sizing - February 15

  3437. Anode to Cathode Ratio, Size, Spacing, Placement in Anodizing - February 12

61633. Methods for evaluating surface preparation steps during the anodizing process - January 29

43777. White spotting on black (and red) anodising - January 11

59981. Calculating required aluminum anodizing time - January 11

53012. Electrolytic Etching of Aluminum - January 10

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2c. ELECTROPLATING and ELECTROFORMING

61683. Cyanide Gold plating Q&A - July 15

61684. Constant current platinum plating -- why does voltage vary? - July 5

61680. Using Zinc Cyanide as Sodium Cyanide Replacement in Cadmium Plating - July 2

11172. Brighteners for acid copper plating - June 21

56121. Sulfamate nickel plating on copper is dull and milky - June 15

56272. Copper plating onto Silver - June 15

61647. Want Consultant for Copper & Silver Barrel Plating on Stainless Steel RFQ: Manila - March 3

15218. Can Sulfur Free Nickel Crowns Replace S-nickel? - May 30

61587. Black stain spots in satin chrome, plus burning - May 28

48074. 48074-3i Hard chrome plating problems 2nd Request- May 27

61662. Stannous sulfate turns brown in storage - May 22

61657. Electro-purification (dummy) methods for electroplating tanks - May 20

33774. Gold plating on sterling silver, Vermeil - May 16

26738. Silver Plating & Brighteners Q&A - May 14

61666. 61666-1i Cast Iron Dies Won't Re-Chrome - May 9

3025. Pitting in acid tin plating - May 6

37167. Nickel plating: Can't Get Enough Thickness - May 6

12243. Black Spots when Tin Plating Brass - April 27

  2454. 2454-1i Gold potassium cyanide gets cloudy below 3.9 pH - April 13

58336. Cadmium Cyanide Plating is Yellow instead of Olive Drab - April 12

58298. Oil mark issue in satin nickel plating - April 5

  2797. Nickel Striking/plating on stainless steel problems - March 24

52562. Color gold/color gilding: Rose/pink/brown gold plating methods & issues - March 20

55624. Zinc plate steel wire then draw it, or draw it then plate it? - March 20

30106. Zinc plating thickness vs. salt spray resistance - March 10

61645. Classification for evaluating corrosion in salt-laden atmosphere - March 1

  0350. 0350-2i Nickel & Gold Plating peels off of Tungsten-Carbide - March 1

61615. 61615-1i Zinc plating with blue passivation is yellowish at holes - February 29

61634. Voltage spikes and amperage drops in Cu-Sn plating - February 27

39520. 39520-1I Copper exposed on parts that are supposed to be nickel - February 26

61640. Spotted cadmium - February 19

40169. Tin plate Blistering - February 19

61603. Zinc Plating has white & red rust without a cause - February 19

25163. Expired Lead Frame effect on Plating Quality - February 2

  9144. 9144-7i Scratches on Hydraulic Cylinders: Mechanical Damage or Plating Defects? - February 1

38475. Alkaline Non-Cyanide Zinc accumulates Zinc oxide or other material at bottom of tank - January 29

28127. Alkaline zinc plating thickness - January 28

61621. 61621-4i Blue spot/growth on a silver plated component - January 16

61628. Surface Area Calculations for Rough Castings - January 4

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

61608. Electroless copper plating onto wax - July 1

61682. Electroless Nickel Plating over Electrolytic Nickel Plating - July 2

61678. Electroless Nickel Plating: Want Consistent Darkening - May 30

53623. Electroless Plating onto LCP Engineering Plastic - May 30

52480. Yellow Stains on Electroless Nickel Plating vipInquirer often helps others, so especially deserves our help - March 21

  4726. Nickel-Chrome Plating on ABS Plastics - March 19

44444. Silvering formulas using silver nitrate - March 3

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

61651. ZrN has sufficient salt spray test resistance but TiN doesn't - March 23

40590. Need TiN coated stainless sheets RFQ open to all: Las Vegas NV - February 20

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2f. GALVANIZING, ALUMINIZING, HOT TIN DIPPING

46006. 46006-7i Questioning the quality of galvanizing - July 15

49676. How to calculate/measure the thickness of zinc coatings - June 21

61676. 61676-1i Galvanization is peeling when bead blasted - June 15

55997. Galvanizing Kettle Dust Collector - Bags Get Oily & Wet - May 12

55564. Titrating for the concentration of HCl in galvanizing flux - April 14

54149. Top Dross is growing since we started filtering - March 20

49192. 49192-1i Galvanizing buildup on MIG wire weld areas - March 11

51659. How much hydrogen peroxide to treat flux tank? - March 11

56867. Spotting, Staining, Blackening of Hot Dip Galvanized Finish - March 10

61641. Having trouble heating the flux bath - March 1

49328. Cost to open a hot dip galvanizing business? - February 20

49271. Zinc ammonium chloride requirements for galvanizing flux - February 19

20172. How tough is galvanneal steel? Will it rust if the coating is penetrated? - February 5

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2g. BLACK OXIDE, BLUING, COLORING, PATINAS

20713. How can nylok nuts be black oxided? - June 5

59418. Passivation after black oxide? - March 29

54394. Black Oxide on stainless steel: problems - March 21

61635. 61635-1i Hot Black Oxide Issue- brownish-green parts and black spots/streaks - February 12

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

55366. Ferritic Nitrocarburizing has red color to it? - June 15

52675. Process Comparison for Tufftriding and Nitriding - March 20

40139. Rust spots on pickled coil after a few days - September 1

26940. Sursulf Processing Q&A, Problems & Solutions - April 4



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

3a. ELECTROPAINT PRIMING, AUTOPHORETIC COATINGS

32574. 32574-11i Ra Increase Caused by CED Coating - July 5

42582. How to perform Acid MEQ of CED Bath manually? - July 4

32574. Dust problem in CED coated GI parts - July 4

56160. Bubbles in e-coat - May 13

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3b. POWDER COATING

61677. Will Powder Coat Survive Etch and Chromate - July 1

61658. 61658-1i Powder Coat Paint issue -- missed areas, fisheyes? - June 15

61667. 61667-1i Smut on powder coated parts after curing - May 14

41802. Will Tin Plating survive a Powdercoating fluidized bed? - April 30

52690. Powder Coating has roughness/bumps under it - April 22

42644. Pinhole problems in powder coating - February 13

39593. L.a.b. CIELAB color issues: gloss variation, matching different finishes, etc. - February 4

61627. 61627-1i Powder Coating of "Black Annealed" CRS - January 3

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

23047. How to Measure Resistance in CED Bath? - May 28

47125. Electrophoretic lacquering for costume/imitation jewelry - April 27

61193. Protecting metal surface with thousands of tiny grooves that trap dirt - March 1

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

25774. Scratch marks are appearing in ABS Parts after painting - July 2

57147. How to make stainless steel non-conductive - June 6

55615. Painting or powder coating the inside of hydraulic tanks? - May 21

40308. Gluing Stainless steel to chrome/copper/alloy plate - March 5

46505. Sublimation Coating Introduction, FAQs and Q&A - February 23

15909. Plastisol & Solvent Ink Formulas & Improvements - February 5

  6926. Painting anodized aluminum - February 1

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4. POST-TREATMENTS

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

36879. Chromating of Zinc-Nickel Plating Q&A - April 27

37772. Can zinc plated parts go on for zinc phosphating? - February 4

34323. Verifying anti-tarnish for copper plating - January 13

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

  1747. Does Thicker Chrome Plating Need Longer Hydrogen Embrittlement Relief? - May 16

33891. Forged Parts Break under Load after Zinc Plating - May 13

33431. How to improve the solderability of tin electroplating? Peel-off & Blistering - April 27

28294. Post plate baking of EN coatings - June 25

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4c. STRIPPING, REWORKS, ETC.

adv. metalx

  2076. Removing anodizing from aluminum - June 19

37569. Nickel stripper for aluminum, question about ingredients - May 15

61648. How to strip nickel from copper plate - March 5

33203. Need paint stripper not harmful to plastic - March 3

22156. Stripping electrophoretic CED coatings - February 2

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5. SUPPORTING ISSUES

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

56140. Analyse Chloride in Chrome Plating Solution -- - July 11

  8904. Salt Spray Hours vs. real life exposure - May 3

44485. XRF and Plating Thickness Measurement - March 7

50132. ASTM B117 Salt Fog Test Chamber Operational Q&As, Problems: Salt Spray Woes - March 3

  0644. Copper Sulphate Test on Gold Plated Part - March 1

35573. Acceptance criteria after salt spray test - February 19

61638. Need lab SOPs for electroplating shop - February 16

36184. Is titration the best method to analyse copper content of ore? - February 5

41654. Determine % Nitric Acid. Titration? Conversion factor? - January 29

  6060. Test for Type 316 vs. 304 Stainless Steel - January 9

18778. Analyzing acid tin baths -- bright and matte - January 9

61619. Salt Spray and Cyclic Corrosion Test for Assembled Parts January 4

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5b. WASTE & WASTEWATER TREATMENT, POLLUTION CONTROL

44241. Neutralization of Chrome after Plating - May 9

59691. Sodium Metabisulfite and its reaction with water - March 26

  7063. Recovery of copper from electroforming solution - January 7

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

20858. Toxicity of stainless flatware - June 6

54906. 54906-2i Stainless pot left on burner; are the fumes dangerous? - April 23

61661. Strange taste & throat closing while wire sanding mystery metal - April 23

55787. Has anyone been diagnosed with Parkinsons after working in the chrome plating industry? - March 10

19953. What is the toxic effects of mixing muriatic acid and bleach? - March 4

  6852. Cyanide Poisoning Issues - February 2

47195. Toxic Lead & chrome in coffee makers & espresso machines? - January 13

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5d. PLANT & PROCESS ENGINEERING, CONSTRUCTION

61685. Plating Is Thinner at Same Amp-Hours than Historically. Current Leak to Ground? - July 8

  2077. Alternate cathode materials for anodizing tanks - June 28

27638. Production of silver potassium cyanide from silver nitrate - January 23

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

18869. Standard/allowable tolerances on zinc plating - May 25

15518. Adhesion testing per ASTM D3359 with Permacel P-99 discontinued - May 16

  9101. Molybdenum disulfide prohibited on 17-4PH? - May 3

26629. I Want to Know about MFZn 8TC Plating - May 9

51970. Need specification QQ C-320 "Electrodeposited Chromium" - April 27

44376. Boeing finish codes Q&As - April 17

61642. What is Alcoa Alumilite Black 326R1? - March 1

26629. What is the meaning of MFZn1-SC - February 16

61632. Does MIL-C-5541 forbid a "Do Not Etch" instruction? - January 26

61506. FAIR 9102 Question re. Chromating & Anodizing - January 19

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

57140. 57140i Procedures QF-09-162 & QF-09-163 for nitric & chromium analysis? - March 30

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5g. MOSTLY METALLURGY; Heat Treatment

61672. Refine Stainless Steel from 316 to 316L - May 28

58484. Can't obtain any Carpenter BG42 -- what steel is similar? - May 22

54607. Inconel 625 Tubes Have Insufficient Chromium on Surface after Sizing - May 22

25525. Tin/nickel interdiffusion Q&A - April 23

12545. Annealing 316 Stainless Steel Tubing - March 1

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5h. PRECIOUS METAL RECOVERY

346/76. Best and Easiest way to refine gold dust to get 99.9% purity - June 19

47967. Recovery of silver from trays, dishes, tea sets - May 21

41239. Recovery of gold from polishing dust, sweeps, floor dirt - May 11

14022. Recover gold from gold plated rims - April 12

43983. Is this ore/rock Palladium & Rhodium - March 1

20033. Recovery of fine floating gold - January 27

50167. How to separate copper from silver - January 11

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6. NON-INDUSTRIAL ISSUES

Hobbyists, DIY, Around Home

23245. What paint for Wellie gumboots? - July 14

18519. Cleaning & polishing gold plated flatware - July 8

15267. 15267 Daisy BB Guns / Air Rifles and Their Black Nickel plating - July 5

38809. Antique baby carriage restoration RFQ open to all: Massachusetts - July 1

39638. gillespie_antique_restorer Gillespie Antique Restorer - June 26

37205. 37205-23i Sterling silver vs. silver plate -- How to tell? - June 26

24079. 24079-1i Nickel plating is peeling off nickel - June 23

  5465. Zinc-nickel plating on aluminum - June 20

57688. Repair metal roof with fiber silver coat - June 15

16699. Geneva Metal Kitchen Cabinets: Painting open Q. - May 28

  4785. Polishing Silver with Aluminum Foil and Washing Soda -- Thanks 24 years later! - May 28

36210. Painting posts of recycled plastic - May 27

20988. 20988-1i Silver Damaged by Hydrogen Peroxide - May 9

  8937. 8937-4i How to refinish cast iron and cast bronze fireplace surrounds - April 27

37205. Sterling silver vs. silver plate -- How to tell? - April 27

11988. 11988-2i Cleaning an old copper kettle for apple butter - April 25

38061. Silver polish (Tarn-X) stained my stainless steel sink - April 23

61663. 61663-1i Mustard Stripped the Copper Plating from Tart Pan - April 22

61659. Vintage Kerosene Lamp: cleaning Copper Plating & Japanning - April 16

25553. Nickel plating of copper cooking utensils - April 14

34076. 34076-2i Artistic copper plating from hydrochloric acid - April 14

  7229. 7229-4i How to refinish brass lamps - April 6

20967. Gold/Silver plating of natural objects Q&A - April 5

20193. Chroming carbon fiber/plastic - March 30

21868. Rings Made from U.S. Coins - March 29

  0338. Zinc plating & chromating of Carburetors - March 26

30965. Can't remove old plastic protection film from stainless steel - March 21

52028. Staining on anodized aluminum window frames - March 21

26845. How to paint a stove top - March 20

61649. Electroplating as forge welding prep - March 20

61644. 61644-1a Oxide Finishing - March 3

23897. Brass lamp seems to be brass plated copper - February 12

56879. Have Blue Gun, Want it Chrome appearance - February 8

  4148. 4148-3i Ruined the finish on my stainless steel fridge - February 8

61631. How to Remove Zinc Phosphate from Frying Pan - January 20

41214. 41214-1i Sticky surface after anodising - January 19

21595. Remove black antiquing from my Citadel class ring - January 18

38108. Jewelry cleaner took finish off ring - January 7

21437. "Rainbowing" and "Bluing" Stainless Steel - January 7

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

61652. Coating stainless steel part using PTFE dispersion open - March 26

52366. 52366-7i Hard chrome plating: Volts, Amps, Anode-to-Cathode Distance - March 21

  3795. 3795-11i Achieve uniform thickness in Cobalt-platinum electroplating - February 15

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

53795. Which chemicals can produce power? - May 22

  0865. Brass electroplating for amateurs and students - April 20

28434. Electroplating with copper sulphate for science project - February 24

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6d. The Artists' Corner

61671. 61670-1i Best Coating for Cast Aluminum Sculpture RFQ open to all: New York City - May 20

50348. How to Make Stainless Appliances a Champagne Gold Color - April 16

61624. 61624-1i Antique French cast metal lamp figurine is what metal? - January 14

  0085. 0085-8i Copper electroforming is too red - January 4

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7. DRIFTED OFF FINISHING, BUT INTERESTING :-)

9941. 9941-9i Why is this penny silver? - July 15

29370. 29370-40i Art Deco Cocktail Rings - July 9

20323. Brass Finishers in the 1800's / 19th century - June 20

54890. 54890-2i Theda Sterling Silver Medals, Crosses, Jewelry Q&A - June 15

61660. 61660-1i How to fix/weld this lamp metal - April 21

1178u. How to remove silver tarnish - April 14

18481. Is our sulfur well water safe for our dogs? - April 14

10153. Sedgwick Residential Elevators Parts and Maintenance? - April 13

32413. About sweet spirits of nitre (the traditional folk medicine) - April 13

61655. 61655-1i Stovetop Cast Iron Trivet Maker and History? - March 29

41759. Where to get replacement leg caps for vintage chrome dinette - March 25

11377. Taking antique brass beds apart - March 22

44464. Who invented words? - March 21

13393. Remove Brown "Varnish" (periostracum) from Shells - March 7

60399. Bleaching Saguaro (Cactus) Skeletons - February 22

11284. Normal weight 2015d nickel shrunk to size of a penny - February 2

29370. 29370-37i Identifying rings/hallmarks - January 27

33143. 33143-13i Stiffel lamp Q&A's open Q. - January 22

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