Glasshouse Studios Blown Glass Oil Slick Taper Candle Holder. Vintage 1985 signer and dated piece. Blown glass piece, cobalt blue/purple iridescent glass with an oil slick finish, can be used as a taper candle holder or pen holder. Bottom is stamped with the Glasshouse “G” and incised “SFD15090.” Also signed on side “BD and '95.