For many of the particle brushes with Glow set, it becomes white with even the lightest pressure. If I turn Glow off, I just get flat color. I'm using a Wacom Intuos3 (PTZ-930 I think). Is there a trick to this?
keep their opacity as low as possible (between 10 and 40 %, I guess? - look up the default settings for "glow" brush in FX category, it was created back in the day and is optimally set-up for this effect), and make sure your colors are low brightness, middle to high saturation for this effect to work.
if you're picking bright colors from the color wheel/mixer, they'll bleach into pure white too fast.
Thank you. I'll give that a try.