HI guys, very long time since I posted

I have in my possession a couple of Lithgow SMLE sporters (model 42 and the .410 conversion that were in pretty bad shape when I found them. I also have a lithgow model 12 that needs the metalwork refinishing. I have been looing into whether it is feasible to do the re-bluing at home and believe that the slow rust bluing process would be well within my abilities, but I cant seem to find the acid commercially available in Australiaicon (brownells, why wont you reply to my emails!)

Does anyone have a "recipe" per say and any sage advice on slow rust bluing? Thanks in advance
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