Phthalo Blue (Red Shade) Pigment Classification: Organometallic Chemical Description: Copper Phthalocynine Opacity/Transparency: 3 Lightfastness Rating: I Permanency: Excellent Colour Index Name: PB 15:1 Colour Index Number: 74160 Munsell Notation Listing: Hue: 7.5 PB Value: 1.25 Chroma: 6.0 Pantone Matching System: 2768 Spectrophotometer Readings: N/A Viscosity Range: 16000-20000 CPS PH Range: 8.7-9.0 Gloss Average: 95.07 CIE L*a*b* Values: L*24.42 a*5.29 b*-9.99 Tint Strength: 70.77