Cleaning up metallic paints

[NOBLNG]

Why is it that metallic paints (laquers) seem to take a lot more flushes to clean out of the airbrush cup than solid colors??

[peteski]

Because the remaining metallic particles shine like little mirrors twirling and flashing the reflected light, so you can easily see them.  I suspect that the same trace amounts of non-metallic paints are left behind after each flush, but they are not as readily visible.