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@deleted
gun blacking for barrels and actions is not an acid finish but alkali. the main ingredient is caustic soda.
i know this because my dad is a retired gunsmith who had a blacking tank. the solution was heated and gave off a lot of fumes. the metal was highly polished then degreased with lime and hot water then immersed in the tank for about 10mins then rinsed in a hot cutting oil/water mix then oiled. it gave a deep lustrous black.
all those little tubs of gun/blue black are a waste of time as the results are patchy and dull in comparison.