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Actually, this is not sand, but while using this in a curent job I noticed its similarity to sand animation, so have fun with it. The trick is to work in color and erase mode alternatively, to get the impression of piling up and removing sand. I needed to use pressure for size, but if you switch that off, you get a nice fingertip.

Thanks for sharing your brushes ! Could you also post an example with the brushes ?

Thanks for sharing your brushes ! Cool & interesting tradition!