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I think the difference is the look on the razor in yer hand...

Black rust looks like "rust" it has bumps and stuff, craters, pits, etc:

Devil Spit is a slick smooth deceiving looking stain...

This is a question I received today in my PM box and I decided it would be better to open up a thread then to just give my opinion...

Mornin Glen,
Three questions,
What is black devil...