Castin Craft Pigment Dye. Opaque Yellow. 1 Fluid Ounce. Opaque Pigment for Polyester Castin Resin and Clear Casting Epoxy. Add one drop at a time to achieve desired color. Add white for pastel colors. Use approximately 1 oz per 32 oz of resin, NEVER more than 3 oz per 32 oz of resin. Quantity: 1 ounce of Opaque carded Yellow Pigment.