Originally Posted by
bnewberry
I love Evaporust and bathe new to me old steel frames in it before applying Frame Saver as soon as I acquire a frame. That said, I put a rusty old knife in Evaporust and it turned the blade black. I have no idea why but it did take care of the rust.
The back residue is the carbon that was in the corroded steel. As the rust dissolves the carbon remains. It can be easily removed by flushing the part in water. Sometime wire brushing is required.
If it's not a cosmetic issue, the black residue will help prevent future rusting.
verktyg
