The stainless steel test acid is applied to the test stone by means of a bar test. Porcedure for the test: Apply the test acid to the object and allow to act for about 60 seconds and the wipe off. If there is a visible optical brightening on the test object, then it is stainless steel. For Pd white gold (750AU / 135 Pd) no change in the surface is visible.
Stainless steel: Lane dissolves automatically after 30 seconds, if necessary dab with cloth.
Content: 20ml