This listing is for a silver acid test kit:

1- bottle Silver acid tester
1 - test stone  2''x2''

 Each bottle holds one-half-ounce (1/2 oz; 0.5 fl oz) of acid solution                                                 

TESTING FOR SILVER

Scratch the piece to be tested over the surface of the black stone provided, press well so as to leave a LARGE AND THICK visible deposit, preferably a line of one to one-half inches long.

Transfer a drop of the silver solution to the scratch made, The color reaction of the solution with the metal scratch will be as follows: (Take into consideration that the background of the test stone is black).

  • 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

NOTE: With the silver solution, it is possible to test directly on the piece being tested, however, the solution will dull the polishing of the piece, and leave a mark where the acid was placed.