I have never used vinegar on blued steel. But I have submerged old rusted wrenches, hammers..whatever, in a tub of white vinegar. After 48 hours there is not a spwck of rust...or anything else...on the steel.

So i really doubt it wouldnt eat through the bluing too. Im not SAYING that...Id just want to test it carefully first. With tools it leaves the metal a light gray.

NDG