Phthalo Blue (Green Shade) Pigment Classification: Organometallic Chemical Description: Copper Phthalocynine Opacity/Transparency: 3 Lightfastness Rating: I Permanency: Excellent Colour Index Name: PB 15:4 Colour Index Number: 74160 Munsell Notation Listing: Hue: 7.0 PB Value: 1.25 Chroma: 6.5 Pantone Matching System: 2766 Spectrophotometer Readings: N/A Viscosity Range: 16000-20000 CPS PH Range: 8.7-9.0 Gloss Average: 94.21 CIE L*a*b* Values: L*24.95 a*8.48 b*-18.01 Tint Strength: 71.17