Color Tests
Permanent Transparent Primary Reactive Dyes
1-1-11

These dye color tests are on a synthetic light tint Naples yellow cloth.
The top row is transparent Tartrazine PY100 mixed at 1:23 water and ethylene glycol mixed 1:1. This is the same hue that is Indian yellow PY153 nickel-complex in oil, which also matches the Original Indian Yellow NY20. It's the primary transparent yellow ink in my inkjet plotter .

The darker spots and wrinkling were caused by me putting the wet synthetic test in a microwave for a minute. (I'm learning.. dyes are new for me) The second row is Spectra Reactive Yellow dye (same color) in a more thinned out dye color. It didn't make a difference if the test was soaked in sodium bicarbonate or not, and past a certain point of dry dye quantity in the wet dye the color is not absorbed.

Daniel Smith just added a new color to their palette 1-15-11. It's called Indian Yellow PY108 Anthrapyrimidine Yellow.
artiscreation.com clames it has magnesium euxanthate as the pigment. If http://www.artiscreation.com/yellow.html#ny20 claim is correct. (I have a call into D.S. now to get clarification.) Than it should be called Indian Yellow. The Pigment Name and Number for Indian Yellow Original is NY20, magnesium euxanthate. Synthetic Anthrapyrimidine Yellow is PY108.

Old Hollands Indian Oil Yellow PY153 (first made in 1900) is a Nickel-complex and it matches in color Indian Yellow Original NY20.
So which is it, a synthetic organic or magnesium euxanthate? Is it a hue color or not? All three colors are permanent and look and paint the same.

The washed out colors did not end up "too" reddish as I stated in the image, so to me it's a good yellow primary dye.

These RCW primary transparent dye colors are going to match the painting pigment colors. Transparent Indian Yellow is winning another pigment battle in the Paint Wars .

The first, top image is the way Indian yellow gets darker, the way nature darkens yellow, the way yellow darkens in the yellow crystals. This is what we see on the RCW. The second, bottom image is the way yellow gets darker in light, RGB. Subtracting light is simular to adding black pigment, it turns green. You need to get the Real Color Wheel. Here are the PhotoShop CS2 to CS5 Swatch Colors Here.     I'll send them to you as links.