EG-006 Sparkle Black EngobeCone 6 oxidation: Sparkle Black Engobe fires matte black with metallic specks. Specks may produce texture. Highly stable. Cone 10 reduction: No change to base color. Specks bloom and become matte. Remains stable. Tips: To enhance the sparkle and improve texture, use your fingers to burnish polish the surface of the ware before the last layer is dry. Polishing is not needed when used in combination. Can be applied to wet clay, greenware or soft fired,