For the past couple of years, my tap water has been curdling my paints.
It all started with a tube of Quinacridone Rust (PO48) from M. Graham. I was attracted to this paint partially because the pigment is listed as non-granulating, and I fell in love with the colour, but ever since I got it, the paint has had a tendency to clump and curdle when mixed with water in the palette or dropped into a wash, resulting in an incredibly pronounced granulation pattern. This pattern becomes even more pronounced when Quin. Rust is mixed with another dark valued, non granulating paint such as a phthalo.
Colour mixing experiments with Quin Rust (PO48) and Phthalo Turquoise (PB16)
I searched the internet extensively, and could find no other reports of quinacridone rust granulating like this. For months I was actually convinced I had received a dud tube, but avoided investigating…
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