Im refinishing a set of Belgian laminated steel barrels. Ive polished them back to bright with 320 grit paper, rust blued them twice then dipped for 7 seconds on ferric chloride. After the acid dip, I burnished by hand and neutralized the acid with baking soda. Ive done several other barrels using this method and had very good results. This time, with these barrels, I get absolutely zero contrasting bands between the steel and iron.

Any suggestions?

Dave