left behind mold residue

[Shedfreak88]

when making an antler mold and a brown or bleached white antler, does the realse agent and the silicone usually leave the antler oilly and more darker then it was to begin with? If it does, then does it do it to both bleached white and brown horns or does it just do it to bleached white horns? and if it does leave stuff on the antler then how might you go about getting it off?...thanks for all the help