Quote:
Originally Posted by hughscpa
So that is heating them with a propane torch and stopping the process be butting them in oil? If so, do I need a special type of oil? If the original finish is okay, there would be no need to reblue correct? My project is a non matching shooter that looks okay but I want to try to fix up.
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Let's remember that heat straw and heat blue are not finishes. Rather they are an incidental by-product of the heat treatment of the part to get it to a state where it is hard enough to resist abrasive ware, without making it so hard it is too brittle to be useful.
Re-tempering a part just to get a cosmetic color can have an adverse effect on the whether the part is too soft, or too hard, to last.