10KT Gold Testing Acid.
Testing for gold and silver made simple.
Accurate results from these easy-to-use plastic bottles with secure, color-coded caps.
Use with test stones.

Testing for 10K, 12K & 14K

You will need the following tools:

• Black acid testing stone that is washed thoroughly with water prior to each test
• Acids
• Gold testing needles with gold tips - used for comparison with test pieces

Scratch the gold piece to be tested on the stone. Next to this position, scratch the appropriate needle (10, 12, or 14K). Place a drop of the appropriate acid on the stone where the gold was rubbed off. If the gold is the same karat or higher, the colour of the scratch mark for the gold piece will appear the same as the mark from the needle. If that gold piece is a lower karat, the scratched deposit will become fainter and eventually disappear.