Cobalt Violet Professional Watercolour – 15ml Glass Jar

Sold by: A J Ludlow Colours


Cobalt Violet 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.

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Cobalt Violet Professional Watercolour is prepared using the inorganic metallic phosphate pigment, triscobalt (II) bis(orthophosphate) tetrahydrate. The pigment has been selected for its purity, light fastness and violet hue, making it ideal for use in A J Ludlow’s Professional watercolour range.

The hue of cobalt phosphate violets varies with the degree of water of crystallisation. The octahydrate’s hue is pink, whilst the tetrahydrate is considered deep violet (from “Pigment Compendium”, page 121).The pigment itself is chemically stable and light fast.It is considered one of the traditional pigments for watercolour (Mayer 1991, page 136), even though its popularity as an artists’ pigment is somewhat affected by its relatively high cost and low tinting strength.

In order to counteract the low tinting strength of cobalt phosphate, A J Ludlow’s Cobalt Violet Professional Watercolour has been formulated with a high level of pigment, so that its colour strength is strong and because it is based on only pure pigment, the watercolour is bright and vivid in colour.


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

Mayer, R “The Artist’s Handbook of Materials and Techniques”, 5th Ed, Viking, New York, 1991.


Pigment Details: Triscobalt Bis(orthophosphate) Tetrahydrate / Colour Index Pigment Violet 14 (C.I. PV14)

Additional information

Weight 80 g


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