Ultramarine Blue Pigment Classification: Synthetic Inorganic Chemical Description: Polyulfide of Sodium-Alumino-Silicate Opacity/Transparency: 6 Lightfastness Rating: I Permanency: Excellent Colour Index Name: PB 29 Colour Index Number: 77007 Munsell Notation Listing: Hue: 8.0 PB Value: 2.00 Chroma: 4.5 Pantone Matching System: 2756 Spectrophotometer Readings: N/A Viscosity Range: 23000-27000 CPS PH Range: 8.3-9.0 Gloss Average: 23.89 CIE L*a*b* Values: L*24.36 a*12.28 b*-25.74 Tint Strength: 79.94