Right Aggie:

Except, to anneal brass you heat it to cherry red and then quench it in water. If you do not quench it, it will become harder. Just the opposite of ferrous metals.

Layout dye has been used for more than a hundred years in machine shops to make the most precise parts ever made like the parts for the Wright Cyclone engine. We still use layout dye to mark parts in precision manufacture of machined parts. It is FAR more precise than using a paper pattern