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Viewing Topic "Mars Yellow and Cobalt Yellow"

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Posted By: George O'Hanlon
Total Posts: 2261
Joined Date: Jun 15, 2004

Lac Water Varnish, and not the Crystal Water Varnish, would be best as a "fixative" for watercolor allowing you to easily glaze over it without lifting the underlying color. Ceracolors Fluid Medium can be used, but it will act as a resist rather than a "fixitive".

George O'Hanlon Technical Director Natural Pigments
Posted : Dec 1, 2017
Posted By: Scott Rowley
Total Posts: 17
Joined Date: Dec 31, 2014

If I used crystal water varnish, or if the medium were ceracolors is it likely that there would be some pretective effect? But if the pigments are spread in a thin transparent film that might negate the effect?

Posted : Dec 1, 2017
Posted By: George O'Hanlon
Total Posts: 2261
Joined Date: Jun 15, 2004

It is unlikely that the benefit of the two color mixture in oil paint would be the same in watercolors, mainly due to the fact there is no binder protecting the pigment.

Cobalt yellow (PY 40: 77357) or Aureolin, a potassium cobaltinitrite pigment, is listed as a Lightfastness rating of II in both oils and watercolors. It is also unlikely that iron oxides would provide any benefit. However, it is a good idea to test such mixtures as this has not been tested.

George O'Hanlon Technical Director Natural Pigments
Posted : Nov 30, 2017
Posted By: Scott Rowley
Total Posts: 17
Joined Date: Dec 31, 2014

If I understand right, yellow and red iron oxides improve the permanance of Alizarin, Tuscan Red being an example. I've been trying something similar with watercolors recently and the Alizarin and Iron Oxide Red make a wonderful color.


I have tried something similar Mixing Mars Yellow with Cobalt Yellow in about 2/3 Mars to 1/3 Cobalt Yellow ratio. Could I expect that the Mars Yellow will have a similar protective effect on the Cobalt Yellow?


Maybe it's premature posting here, since I can go and do some tests myself, which I plan to do. Since I have read that Iron Oxides are strong UV absorbers, It seems reasonable to assume that Iron Oxide pigments have a protective effect when mixed with colors that tend to fade in UV light.

Posted : Nov 30, 2017

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