Bullseye 000114 Cobalt Blue (Opalescent) 10x10 Sheet 3 mm COE 90 Iconic, saturated cobalt for instant depth and drama—holds color beautifully even when used thin. Type: Opalescent COE: 90 (Bullseye-compatible) Thickness: 3 mm Dimensions: approx. 10x10 Reactivity: Not listed as copper/sulfur/lead-bearing; generally neutral and plays well with others. Use it for: Ocean motifs, night skies, strong accents, and layered transparency effects. Hand-cut in-house at Art Glass City. Each 10x10 sheet may have minor size variations and will include Bullseye’s natural rolled edge.