Watchmakers use burnishing on softer types of steel to both polish and harden it. I’m not sure given that 18 Karat gold is 75% gold that burnishing was harden it much. It’s intrinsically a soft material and you can only work harden it within limits.
Watchmakers use burnishing on softer types of steel to both polish and harden it. I’m not sure given that 18 Karat gold is 75% gold that burnishing was harden it much. It’s intrinsically a soft material and you can only work harden it within limits.