I am looking to achieve a carnival glass finish on 000100-00650-B Black Opalescent glass. I am kiln casting open face mould relief sculptures that are roughly 12" x 12" x 1" in a Skutt GM10-14 using plaster/silica molds. I have read that spraying certain chemicals on the glass at various temperatures (with an adequate fume hood) will achieve this finish, but all the information online is varied and insufficient.
Additionally, is there another way to achieve this finish? Carnival glass is also called iridescent glass, aurora glass, dope glass, rainbow glass, taffeta glass, and sometimes the effects appears on depression glass.
Thanks again for all the help.