OIL PASTEL AS A RESIST WITH WATER-BASED PAINT

Traditional oil pastel (not the water-soluble kind) 

acts as a resist with watercolors, liquid acrylics, 

thinned tempera or gouache.

I used good, smooth watercolor paper and applied the oil pastel heavily in the line design seen below.

Yup, this is a simple resist demonstration!

Then I washed in some diluted gouache.

I added a few white accents later.

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