[David]

I find that when I use Alum powder in the ink it creates an aquatint effect.

Ie it seperates the pigment into small dots ( much like an aquatint in etching) .

This has probably because alum acts like a flux and seperates the pigment from the water.

The other interesting phenomena is that when I add an extra colour ,say blue to the black ink ,the blue will be cats out of the line causing an interesting ‘ halo ‘ effect with the line.

We call it the magic ingredient .

[Author]

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