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At Jerry's....

http://www.jerrysartarama.com/art-spectrum-colourfix-fine-tooth-pastel-paper

http://www.jerrysartarama.com/paper/pastel-paper-and-boards/art-spectrum-colourfix-pastel-primer

From Google....

https://www.google.com/webhp?ie=utf-8&oe=utf-8#q=ground+pumice

https://www.google.com/webhp?ie=utf-8&oe=utf-8#q=ground+silica

Bet you could find 'ground granite' as well.  All of these would mix with various acrylic mediums/gels/paints.

Cheers,
bab


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