I don't know if it is the same, but using propane, oxg/act, mapp and with the part being very clean and free of oil, grease and finger prints, is heated till it turns blue and then cooled by air.

You can get very close to getting this same effect, by using Oxpho Blue a few times and then buffing on a cotton wheel.

Last edited by JDW; 08/01/12 03:34 PM.
David