Test needles - 8, 14 and 18 KT gold

TEST NEEDLES

3 pieces in a set to test gold fineness 0.333 ( 8 Kt), 0.585 (14 Kt), 0.750 ( 18 Kt)

Approximate method for testing gold on a test stone 

Products required:

• Test needles / test star 
• Lidite testing stone
• Test fluids

The gold alloy (product) whose purity we want to determine is used to create a mark on the surface of the test stone. Match the needle grade to the expected grade of the tested alloy and create a parallel mark. Apply a small amount of testing liquid to the resulting marks and remove the excess (e.g. with blotting paper) after a suitable period of time. 
Visually compare the resulting colour changes of the alloy's marks with those of the needle. 
Darker traces indicate a lower gold content. Obtaining the same colour shade indicates that the examined alloy has the purity of the test needle 
The test can be repeated or more marks can be made with several test needles of different grades.

NOTE ! Keep test needles clean, away from acids and test fluids.

Instructions for use are included in the package and are available in the annex below.

Instructional video - How to test gold on a testing stone