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Detect if zinc, cad or chrome plating.

Detect if zinc, cad or chrome plating.

Detect if zinc, cad or chrome plating.

(OP)
Good Day,
.  We buy, make and sell fasteners of all types and sizes. What I am looking for is a spot check kit that will allow me to check and verify that we do in fact have zinc plating, or cadmium plating, or chrome plating. I know that in most instances the blue hue or yellow hue will give an indication of zinc or cad, but I'd like a litmus test.
.  At one time Systems Scientific Laboratories had a spot check kit where when drops of the prescribed chemicals from the kit were put on a litmus type paper, then the fastener (or whatever) put on the chemical spot, the resulting color that appeared on the paper told the story. I cannot locate Systems Scientific and have been told they no longer are in business.
.  Any suggestions would be appreciated.
.  Thanks for your time.

RE: Detect if zinc, cad or chrome plating.

Zinc vs cad or chrome is easy--just take an eye dropper and put a drop of Muriatic acid on the part in question. If zinc, the plating will rapidly react (vigourous foaming action) whereas cad or chrome will not.

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