Gold Silver Platinum Test Kit – Acid Testing liquid + Graphite Touchstone

Verify the gold metal etc content in items.

USE WITH CARE: Touchstone testing incorporates the use of acids, so pay close attention to safety.

CAREFUL PROCEDURES ARE A MUST.

Touchstone testing is based on the fact that 24k gold resists all but the strongest acids. The purer the gold, the stronger the acid required to dissolve it. Measured strengths of nitric acid are used to test for 14k and lower. Aqua regia, a mixture of one part nitric acid and three parts hydrochloric acid, is used to test higher karat purity through the process of comparison and elimination.

GOOD INSTRUCTIONS HERE https://www.gia.edu/bench-tip-use-the-touchstone-method-for-testing-purity-karat-gold#:~:text=The%20purer%20the%20gold%2C%20the,process%20of%20comparison%20and%20elimination.

Real gold will stay on the touchstone, false one will be dissolved or oxidized to blue.

If the sample disappears, then the item is below the karat of the solution.

This solution works for testing any gold which you believe to be 10K, 14K, 18K, 22-24K, Silver, and Platinum pure.

Test jewellery, coins, antique gold, silver, platinum collectibles, and more.

Rub the black stone, and leave a small sample on the stone, Apply a drop of acid on to the stone; real gold will stay on the touchstone, false will be dissolved.

The purer the gold, the stronger the acid required to dissolve it.

Measured strengths of nitric acid are used to test for 14k and lower. Aqua regia, a mixture of one part nitric acid and three parts hydrochloric acid, is used to test higher karat purity through the process of comparison and elimination.

Acid Testing Water :4.5 X 3 cm ( 3 ML) Graphite Stone : 8 X 5.5 cm Quantity: 1 set

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