Based on my talk with Dale, one place where he varies a little from Dr. Gaddy is by doing multiple brownings before any boiling. I've found this to work well. Less effort involved to brown multiple times to establish a respectable pattern contrast, and then commit by converting the rust.
I've also been having good results from carding the etchant with a very wet slurry of baking soda. This is in Mr. Flanigan's process. It gets the job done, is controllable, and baking soda will neutralize the etchant, which has to be done anyway.
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