Cobalt Pink Professional Watercolour – 15ml Glass Jar

Sold by: A J Ludlow Colours


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

The Cobalt Pink pigment available to the Victorian artist was based on cobalt magnesium oxide and, like Cobalt Red (also available at the time), was regarded as inferior and more expensive to the red pigments derived from madder.These cobalt pigments were considered chalky and have poor hues and so soon fell out of favour (from “Pigment Compendium”, page 121-122).

On the other hand, the hydrated cobalt phosphate has a soft pink hue, which is bright, unlike the “chalky” pink based on cobalt magnesium oxide. The resulting watercolour is transparent and so enhances the pale pink hue with a luminosity derived from the whiteness of the watercolour paper that creates bright washes of colour. The pigment itself is chemically stable and light fast, but has a relatively high cost and low tinting strength, which has tended to reduce its popularity as an artists’ pigment.

In order to counteract the low tinting strength of cobalt phosphate, A J Ludlow’s Cobalt Pink Professional Watercolour has been formulated with a high level of pigment. Therefore, its colour strength is strong and because it is based only on 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


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

Additional information

Weight 80 g


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