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How to test gold, platinum & silver with acid test kit

19 March, 2010 (15:21) | How To... | By: Trader Lou

This is a simple guide to test precious metals with testing acids.
You will need the acids, test stone to rub the metal onto and cloth or napkins.

Please note that the acid will stain your skin or worse, so be careful not to spill any on yourself and don’t even think of getting any in your eyes.

Gold:
There are 9kt, 14kt, 18kt and 22k testing acids.
The process is simple, scratch or rub the metal (jewelry) onto the testing stone. Try to do it in a spot that won’t be noticeable.
Place app half a drop of the closest acid to the karat you estimate the metal to be. Mostly I like to start with 14kt and move up or down.

•If the acid dissolves the metal it’s less then the karats on the bottle and you should try again with lower level acid.
•If it dissolves the metal slowly, it’s possible you would have a bit less then the karat of the acid in the bottle.
•If the metal stays it’s most likely the karat of the acid in the bottle.

Platinum
Should stay and not dissolve under the platinum acid. Some platinum is 800 type of platinum and will dissolve a bit.

Silver:
Rub extra metal onto the stone, apply a nice drop and wait for a reaction.

•0.999 pure silver will turn bright red color
•0.925 sterling silver will turn dark red color
•0.800 silver will turn brown color
•0.500 silver will turn green

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