That's certainly a bold claim or maybe not, as cold blueing doesn't exactly have the greatest reputation.
I just tripped across a video where a guy took Brownells Mark Lee Express Brown #2, applied it to a barrel using a fair amount of heat and then put Oxpho Blue cream over the top of it. He did several coats and did a some very minor polishing with steel wool between them. It was absolutely an amateur night application.
The thing is, it looked great. I know you certainly can't see very well on a video but it looked much better than my standard Oxpho Blue job.
Has anyone used this or a similar technique? I really never thought of using different/multiple chemicals. I really would like to try this on one my home gunsmithing projects.
Here's the link: https://www.youtube.com/watch?v=X-CDOJF-TmY