Used in testing silver. Scratch the object on the test stone. Drop silver testing solution on the line and watch the color change reaction.
Bright red = Fine silver (.999)
Dark red = Sterling silver (.925)
Brown = 800 silver (.800)
Green = 500 silver (.500)
Sold in a 1/2oz bottle.
Keep cap on bottle when not in use. Do not store near electronics such as a scale. Testing soluiton should be replace after approximately 6 months.