[hammerdownnow]

Vinagar can be used to etch damaskus to any degree of depth you want. From just being visable to feeling it like the topography of West Virginia. It works pretty much the same way as FC, but much slower. Also, FC is a type of salt and vinagar is an acid. Slower can be better when new at it. But slower can result in forgetting you have something soaking and you could ruin a blade by leaving it in vinagar for say, a week. Don't ask me how I know. Also soaking in vinagar overnight removes scale from a forged blade.