Birddog: You can send any plum brown you want to throw away to me! I don't know how you use, it, but I am not in love with " Carding " rust off metal, as some members here are, it seems.
I get a beautiful Chocolate Brown color using Plum Brown by heating the metal up with a propane torch, and applying the browning solution with cotton Q-tips or swabs.
I Hang the barrel from a coat hanger through the tang screw hole, from the garage door rail over head, and use a old cut off piece of ramrod shoved in the barrel to move the barrel around when its hot, so I don't get any fingerprints on it.
I clean the barrel with soap and water first, dry it, using paper toweling, and then use alcohol to clean the metal before browning.
The metal browns Instantly, and if I brown from the bottom of the barrel( the muzzle is down so that is the " bottom" ) and slowly work my way up, moving my torch up the barrel as I go, I am able to brown the barrel in about 10 minutes if I go very slow. A yellow white residue is left on the barrel.
I let the barrel cool and then take it into the kitchen sink, and use a coarse rag to wash off the residue. I dry the barrel and inspect it to make sure I browned everything, from every angle. I clean it off again with alcohol, and then take it back to the garage, where I heat the whole barrel up again.
This time, when its sizzling hot, I spray the browned barrel with WD40, which burns and puts out a lot of smoke, but seems to darken the color a bit. The heat opens the pores of the metal so that the finish is deep. I spray until the oil is no longer burning, or smoking, and leave it dripping off oil onto newspaper until the next day.
Browning a barrel with Plum Brown, this way, is fast, and produces a durable finish that does not scratch easily. I have carried my shotgun through brush, and banged around shooting it at both the range, and in the field, and while the stock has some war wounds evident, the barrels are still fine.
I have many MLers come up and ask me about the finish, as they too have used browning solutions cold, and have had indifferent results, and days upon days of work to get a barrel right. None has produced the deep chocolate brown finish I have on my gun. None of the browned barrels I have seen done with cold browning solutions have been as durable as mine.
I obviously can't have first hand experience with all browning solutions, as there are many on the market, and new ones appearing every couple of years. I tried three different browning solutions on scrap metal the first time I browned anything. I have not tried Laurel Mountain solution, but am impressed with the pictures shown on this forum by men who have used that product, and with their comments about it. I may just have to buy some and try it on some project some day.