Davy's Gray is a soft grey colour traditionally including powdered slate pigments. It was developed by Winsor & Newton for the 19th c English artist Henry Davy, a pupil of famous water-colourist J S Cotman. Lysekthet (ASTM) Arkivbestandighet AA Pigment(er) PBk19, PY42, Pbk7 Transparens/Opasitet T