Detect if zinc, cad or chrome plating. 1

[QAFitz]

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.

 

[swall]

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.