With some pigments my oil paint slumps. I use Tixogel VZ, Aluminum Stearate, wax, and fumed silca. I use a ball mill with acetone and linseed oil to grind the pigment and then evaporate the acetone. I find with a pigment like ultramarine blue I still have problems. The oil also separates from the paint in the tube. I just don’t know how much of anything to use or how to use it. I grind the Tixogel VZ into acetone first, that is about all I can find on how to thicken. Thanks for any input.
The issue you are facing is that ultramarine blue wets poorly in oil becuase it is a hydrophilic pigment. Since it wets poorly it will also separate. However, aluminum stearate will usually provide sufficient wetting to overcome these issues.
Thanks George, you are “fast on the draw”
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