Gold Test Needles Set of Five-10K-12K-14K-18K-& 22K Art Clay Silver After wrapping and heat curing

After wrapping and heat curing (conditioning) your new block

it can also be modified for custom applications specific to your bench work

it scrapes the inner wall

this German machinist square is the metalworker's equivalent of a woodworker's try square

controlled use at the bench

Gold Test Needles Set of Five-10K-12K-14K-18K-& 22K Art Clay Silver After wrapping and heat curingGold Test Needles Set of Five (10K, 12K, 14K, 18K & 22K) This professional set of gold test needles includes five needles, each tipped with a different karat of gold, allowing jewelers and metalsmiths to perform comparative acid testing across the most common gold purities. By rubbing each needle against a test stone alongside an unknown gold item, then applying testing acid to both marks, you can observe and compare the acid reactions to estimate the