The paper in this block from Clairefontaine is strong

5Gloss Average: 69

Colour index number: 77357

Colour number: 148

lightfast and opaque

golden fluid carbon black Williamsburg The paper in this blockProduced with soot from burning gas the dark and fine particle size makes this our darkest most neutral black. (Series 1) Pigment Classification: InorganicColor Index Name: PBk7Color Index Number: 77266Chemical Description: Nearly Pure Amorphous CarbonOpacity Transparency: OpaqueLightfastness Rating: 1Permanency: ExcellentMunsell Notation Listing: Hue Blac Value Chroma 0. 3Gloss Average: 79. 23Viscosity Range: 400 1000 CPSCIE L*a*b* Values: L*25. 77