If You Work The First Time With Test Acids; Gold Touchstone - GOLDANALYTIX 06-03-00015 Benutzerhandbuch

working with them. In case of skin or eye contact with the
chemicals, flush the contaminated areas carefully with
water and contact a doctor immediately. Show your
doctor the label on the bottle so he can give the right
advice and start proper treatment.

4. If you work the first time with test acids

The assay by the test needle is one of the oldest methods
for rare metal testing. The test material is generated by
scratching the sample on a touchstone. After coating the
abrasion with the test acid you get information about the
composition of the sample. Especially in case of gold
alloys, the exact composition is essential. The following
gold alloys are distinguished:
Gold fraction %
0
33
58,5
75
90
100

5. Gold touchstone

Touchstone care agent
The care agent is used to increase the contrast between
the touchstone and the abrasion. Before using the test
stone give one or two drops of the care agent on the
surface of the stone and levigate it with a tissue.
Carat
0 carat
8 carat
14 carat
18 carat
21 carat
2 carat
4
4
Alloy
no gold
333 gold
585 gold
750 gold
900 gold
pure gold