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Old 12-27-2016, 09:56 AM
Robert5040 Robert5040 is offline
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Problems making casein paint

Hi,

I've been experimenting with making casein paint using borax and casein powder. I've tried the Natural Pigments recipe and the Earth Pigments recipe (they are quite similar except the the Natural Pigments recipe uses a bit less borax and heats to a higher temperature).

The paint/binder produced is translucent with a yellowish color. It dries to a hard, brittle film and it seems to make an excellent paint.

However ... I need the paint not to be soluble in water ... or at least to be very water-resistant, and unfortunately this is not happening with my paint. It is almost as water-soluble as watercolor paint.

The literature says that casein paint is water insoluble when dry ... but mine is not, even after a few days.

Advice would be most welcome!!

Thanks

Robert
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Old 12-29-2016, 03:32 PM
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Delofasht Delofasht is offline
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Re: Problems making casein paint

Casein becomes insoluble in water after a couple weeks of curing, if thickly applied it can take even longer. As an alternative to waiting you can apply a layer of Acrylic medium as an isolation layer between the Casein and your new layer of paint. Acrylic medium dries fast and takes only a couple days to become water insoluble (as opposed to the weeks of Casein).

This is actually a feature of Casein to be reworkable for a few weeks though, and does make it more like Gouache. It's just time though. I prefer the matte look of Casein as compared to Acrylic (which too can have a matte look, though not as chemically compatible with some of my other paints). If you can wait the time needed then allowing Casein to fully cure will provide one of the best surfaces to paint over with other kinds of paint.
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