Blackberry Cream Opal Art - 96 Coe Product Description Add these dramatic swirls to your fused glass art! Use multi-color opal mixes to create spring projects full of realistic outdoor scenes of sunset skies, rolling mountains and wavy seas. Deep aqua and concord on Firelight White. This dual-duty product is perfect for stained glass applications and is also fully heat compliant for use by the hot glass artist. 96 COE.