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Here is an interesting experiment. I am in the midst of painting a little canary study to test how to keep the chroma of my Cad Yellow, while darkening the values.
Supplies: M. Graham cadmium Yellow
M. Graham Dioxazine Purple
and Micheal Harding Yellow Ochre
Mixing the Cad. Yellow with it's compliment produced a hue and major value shift and I ended up with a muddy looking yellow-green
Mixing the Cad Yellow with a earth color - Yellow Ochre retained the chroma and gave me nice value shifts
I also found out that Yellow already is a high chroma color and lightening it would only kill the intensity of this color. So I made this my highest value and am working the other direction, progressively getting darker. Since this a portrait artist forum, I don't think Canaries are welcome, but I will post the results as soon as the little guy is finished. Sorry about the enthusiasm, but I am just tickled pink to finally have the answer to my Chroma question!
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