Pigment Classification: Inorganic Color Index Name: N/A Color Index Number: N/A Chemical Description: Aluminum Oxide Particles Opacity/Transparency: Lightfastness Rating: N/A Permanency: Excellent Munsell Notation Listing: Hue N/A Value N/A Chroma N/A Gloss Average: 0.75 Viscosity Range: 7500-9500 CPS CIE L*a*b* Values: L* a* b*N/A Tint Strength: N/A Course Alumina is a clear acrylic gel containing aluminum oxide (Al2O3) particles with the consistency of fine sand.