I can dye the crust into many diff colors, most polular being black, chocolate, nicotine, and honey. Shade matching available if customer has a special request for a specific color no problem. As far as dyes being used these are special dyestuffs that we use in the leather tanning industry and not something foud commonly in leather crafting supply shops (Tandy, etc). They are from the chemical family of 'acid' dyes and are noted for there brilliant shades and good lightfastness (will not fade). Recoloring finished exotics could be a challenge I'm sure u can relate. The prob would be that in order to give a good redyeing u would first have to 'strip off' the finish or else the dye will not penetrate well (again we use special chems for this but u could prob find a good stripper at crafting supply houses)...some finishes are easier to strip than others and some are downright impossible to strip or the grain can be damaged as a result.