Mark Lee Express blue/brown
Polish bright then cook everything in boiling water with lye, don't touch with bare hands, remove from hot water and use a clothes pin dipped in the solution. Swab, It will dry as it evaporates, you should see some rust like reaction, dunk in rolling boil and repeat, then in hot clean water.

When your done, neutralize with cool clear water and baking soda mixed in with it. It looks like iodine or or beta-dyne. I just pour boiling water in a pvc tube for the barrel. I  do the small parts in the house when nobody is around but don't get it on the countertop.
It will wipe up but you have to be quick. Rolling boil is the key and good polish. Its easy to do and looks pretty decent. Pretty durable too. It will not do hi-force 44 to well so you have to sweat/ solder to a very clean line.