Quick test for uniformity of plating on outer layer of stranded conductor

a test to determine the identity of an element in a compound by the color that the compound imparts to a flame.

It is test that is conducted to identify a mineral. It is a complex process. A tiny fragment of a mineral is placed at one end of a platinum wire and held in a flame. The change of the flame changes due to the presence of different metals like sodium will give yellow flame; copper, blue and green; potassium, violet; etc.