A J Ludlow Isoindolinone Yellow Professional Watercolour

Isoindolinone Yellow 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, Isoindolinone Yellow watercolour is lovingly handmade in the UK by a skilled artisan from the best ingredients and finest pigments.

Isoindolinone Yellow 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 Isoindolinone Yellow 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 a red shade organic yellow pigment, from the azomethine-type isoindolinone class of high performance and heat stable pigments. This pigment has been selected for its red-shade hue, high tinctorial strength, excellent light fastness and transparency. It therefore affords a transparent watercolour (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 Isoindolinone Yellow Professional Watercolour*.

The isoindolinone Yellow 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 structured consistency, but is easily transferred from the jar to the watercolour palette using a clean spatula or palette knife. As with all the Professional Watercolours from A J Ludlow, once water is added, this watercolour has excellent flow and is a joy to paint with.

Isoindolinone Yellow is a bright and intense red shade yellow which can be used on the artist’s palette as a warm primary yellow. As it is based on an organic pigment, this watercolour paints out smoothly and in graduated washes, its colour goes from almost a rich transparent orange at full strength to a radiant yellow, which is similar to that of traditional Indian Yellow ( C.I. NY20).

Pigment Details: Substituted diamine azomethine-type terachloroisoindolinone / Colour Index Pigment Yellow 110 ( C.I. PY110)

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).