Test of the pitch hardness

This post is meant to give information for groped to make things easier when trying to make the tool into pitch, necessary for the Bi phase and polishing parabolizzazione. Generally, when it is explained how to make the dough for the tool, there are hardly indicated the precise percentages for ingredients, but generally

Tool with "candy" pitch

When in processing a mirror you will reach a refined and smooth surface with abrasives in grain 800 or outside, You must establish for preparing the tool with pitch patina coverage, to proceed in the following two important final processing stages, that are the transformation of the frosted surface but opaque, in