A J Ludlow Cobalt Chromite Blue Professional Watercolour

Cobalt Chromite Blue is just one of the bright and exquisite Professional Watercolours from A J Ludlow. Being based on a single pigment with excellent permanence and light fastness, ensures that this watercolour’s properties are exceptional. As with all our fine-art materials, Cobalt Chromite Blue watercolour is lovingly handmade in the UK by a skilled artisan from the best ingredients and finest pigments.

Cobalt Chromite Blue professional quality watercolour is supplied in a 15ml glass jar, because:

• The watercolour’s wet mass tone can be seen through the walls of the jar;
• The colour can be easily transferred from the jar to the palette with a palette knife.

But more importantly, there is no need for unnecessary additives or formulation changes to make processing in our colour manufacturing workshop easier, allowing the Cobalt Chromite Blue watercolour made by A J Ludlow to be at the highest pigment concentration and the pigment’s unique properties to be uncompromised. Anything less would be at odds with the brilliance and performance demanded of a professional quality watercolour range.

This Professional Watercolour is prepared using the mixed metal oxide inorganic pigment, cobalt chromium aluminium oxide, which gives the watercolour its bright and intense green-shade blue colour excellent light fastness and opacity. It therefore affords an opaque watercolour, which is semi-opaque in thin washes (as can be seen in the figure 1a below).

Figure 1: Assessment of (a) the opacity/transparency and (b) staining power of A J Ludlow Cobalt Chromite Blue Professional Watercolour*.

The Cobalt Chromite Blue watercolour does not lift out completely (as can be seen in figure 1b above) and so has a propensity to stain the watercolour paper.

This watercolour has a fluid consistency and is easily transferred to the watercolour palette using a clean spatula or palette knife.

The cobalt chromium aluminium oxide pigment is often described as “cerulean blue”, but its colour is a greener-shade of blue than that of the traditional cerulean, cobalt (II) stannate.

Pigment Details: Cobalt Chromium Aluminium Oxide / Colour Index Pigment Blue 36 ( C.I. PB36)

Footnote:

*Details of how each watercolour is tested are given in the May 2021 ARTicle “Testing and Assessing the Properties of Watercolours – Part 1 ” (see also Part 2 of the ARTicle, which was published in June 2021).