A J Ludlow Phthalocyanine Green (Yellow Shade) Professional Watercolour

Phthalocyanine Green (Yellow Shade) is just one of the bright and exquisite Professional Watercolours made in the UK by A J Ludlow. Being based on a single pigment with excellent permanence and light fastness, ensures that this watercolour’s properties are exceptional.

Phthalocyanine Green (Yellow Shade) Professional Watercolour is prepared using the synthetic halogenated aromatic macrocyclic organo-metallic pigment, copper polybromo, polychloro-phthalocyanine, with 4 to 9 bromo-substituents and 8 to 2 chloro-substituents at the 16 peripheral reactive sites on the molecule’s four benzene units (Pigment Compendium, page 305). The pigment has been selected for its purity, light fastness and intense yellowish-green hue, making it ideal for use in A J Ludlow’s Professional watercolour range.

The yellow shade green is achieved by partially substituting the chloro-substituents of copper polychloro-phthalocynine with bromine. Bromination is less efficient than chlorination and as a consequence the maximum substitution is 9 bromine atoms.The halogenated phthalocyanine (Pc) has the general formula of CuPc(Cl)x(Br)y, where the number of substituents (x+y) is approximately equal to 15.

In A J Ludlow’s Phthalocyanine Green (Yellow Shade) Professional Watercolour, the pigment is pure and the tinctorial strength is very strong and so is best used sparingly when initially mixing with other colours.This watercolour has a softer yellow shade of green than the Phthalocyanine Green (Blue Shade) and so can be mixed with various yellows and earth colours to produce natural looking greens for foliage and landscape painting.In particular with Isoindolinone Yellow it can be mixed to make a lightfast green with a similar hue to natural Sap Green, which traditionally is made from buckthorn berries.

Eastaugh N, Chaplin T, Siddall R, Walsh V, “Pigment Compendium: A Dictionary and Optical Microscopy of Historic Pigments”, Routledge, Abingdon 2013

Pigment Details: Brominated Copper Phthalocyanine / Colour Index Pigment Green 36 ( C.I. PG36)