- Pigment Number: PY139
- Lightfastness Rating: ASTM I
- Pigment Opacity: Semi-Transparent
- Paint Opacity: Semi-Transparent
- Series 6
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Iso Yellow is short for Isoindoline which is itself a shortening of the full chemical name for this pigment. It is a vat pigment. Vat pigments are called that because they are made in vats but while that sounds fairly ordinary, vat pigments have a reputation for being particularly lightfast colors with all round good qualities. They have high tinting strength and are very clean colors.
Despite being simply called a yellow this particular yellow is a very reddish-yellow and is on the verge of being an orange., It reminds me of the bold colors seen in art from exotic civilizations. It is the sort of color Rousseau would use for a tiger in the jungle. I have seen these sorts of colors in watercolors by Klee It reminds me of reminiscent of saffron robes on buddhist monks. I see this color in sunsets and marigolds.
It is a beautiful and inspirational color. Mixed with a red it will produce a brilliant scarlet, while used with a cooler yellow can produce the full range of yellows found in nature. Added to Burnt Sienna it can make the beautiful earthy colors seen in deserts. There are lots of reasons to want to reach for a tube and explore its extraordinary beauty.