OB;
I had not personally tried it, but knew that Brownell's had always advertized the High Force 44 would withstand bluing. I do recall Oscar stating the bluing salts attacked the "Tin" content of the solder. As HF-44 solder is predominatly tin I can only assume this was once Oscar was wrong. I had always been of the opinion the salts attacked the lead, but I'm no chemist.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra