Vall, any chance of a link to Mr. Springer's video?  And thanks for the thread ssdave!

Regards,
Joe

Did the final cleanup after the 5th cycle, and I'm happy with it. Nice outcome! I’m glad to see that other folks play with the same things I do. I’ve experimented with rust bluing over the last 10 years. As folks have mentioned, each time has had its differences. I have a box made of 1/2” ridged foam long enough to cover a rifle barrel. I support the barrel on a 3/16” steel rod on vee blocks made of scrap wood. A thrift store 3 gallon pot is used for small parts. The lid sits upside down, parts hang from wire on a rack, then the inverted pot is slipped over the whole thing. I don’t use water for humidity, for all the listed reasons. A former boss used a couple paper towels dampened and laid in the bottom of the sweat box. I’ve used that method ever since. The rust builds slow, and is very forgiving, time wise. Except for the initial coat of acid on bare metal, my parts aren’t really orange unless the light hits just right.  I boil, wipe down with paper towels, then thoroughly card with steel wool each time. I’ve tried various numbers of cycles and learned you can bring things back to life, yet not make them look brand new. Differing degrees of sanding, polish, etc., will affect your results.   

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I'm doing some small parts now, barrel bands and sling swivel mounts and grip cap.  They're highly polished, and overnight cool rust barely rusted where the receiver would have had more rust.  They're boiling now, and turned black, will cool rust them again today while I'm at work and boil again this evening.  Learn a bit each time.