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topic 34271

Trying to identify plating

What plating is on handwheel of Chinese lathe


Q. I have a garden-variety Chinese lathe (14" x 40"). The handwheels appear to be cast (probably iron) with the center hub and spokes painted, but the outer rim has been machined and appears to be plated. It has a dull, matt silver appearance. Does anyone have an idea what the plating may be, and if I could duplicate it easily in my home workshop?


Roger Head
- Australia


A. The initial surface will determine the finish of the plating job; the fact that it is a matte finish just means that the metal underneath had a matte finish when it was plated.

In addition any plating method (with few exceptions) for use on tools usually involves hazardous chemicals that are difficult and costly to dispose of, and equipment that a hobbyist doesn't have access to.

If you want a clear answer take it to a professional plater and have them figure it out.

Marc Banks
- Elizabeth City, North Carolina USA

What is this yellow plating on shoulder bolts

July 22, 2014

Q. I have a bag of shoulder bolts (M8 x 1.25 x 44 mm) that I found in our warehouse. They appear to be yellow - possibly dichromate finish - but no identification. (They are attracted to a magnet).
Is there a way to determine what the finish is?

Joseph warner
- Kansas City, Kansas US

July 2014

A. Hi Joseph. Just from appearance, odds are about 99+% that it's a sacrificial plating of cadmium, zinc, or zinc alloy with a yellow chromate finish.

But whether it's cadmium (which is a bio-accumulative toxin that should be reserved only for very special needs) and whether the chromate is hexavalent (which would be a RoHS problem) can't be determined visually or with normal warehouse stuff. Some plating shops could do spot tests to determine what it is if it's a large enough bag to be worth it. (Are you sure those bolts are new? There is a ring just below the head that looks either much less worn or much more worn than the rest of the shoulder). Good luck.


Ted Mooney,
Teds signature
Ted Mooney, P.E. RET
Pine Beach, New Jersey

July 25, 2014

thumbs up signTed,

Thanks! I appreciate your help.

Joseph warner [returning]
- Kansas City, Kansas US

How to identify plating on antique police badges

November 13, 2016 -- this entry appended to this thread by editor in lieu of spawning a duplicative thread

Q. I am trying to identify the type of plating and base metal used on antique Columbus, Ohio Division of Police badges. Research confirms these badges were produced from the late 1870s until 1908. Approximately 14 of these badges are known to exist. The finish ranges from an intact yellowish silvery appearance to completely devoid of finish. Due to their historical significance and value, polishing or destructive testing is not possible.

34271-2a  34271-2b  34271-2c

Alex Behnen
Museum curator/archivist - Westerville, Ohio

November 2016

Hi Alex. I'm reluctant to guess what the substrate or plating is, but a university in your area will probably have an X-ray fluorescense machine which can answer your questions without polishing or destructive testing. Good luck.

It's interesting that the logo on the Captain's badge is more abstract. Someone knowledgeable in artistic styling trends may be able to say which logo is older based on art trends.


pic of Ted Mooney
Ted Mooney, P.E. RET
Pine Beach, New Jersey
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