Thanks Pappy, Scowler, and Sadie. I really enjoyed making them. And now love shooting them!
Scowler, I used eggshell for the white (chicken eggs), though I think bone or shell might grind up a little finer. I will try that next. The black was charcoal from the fireplace. The red was some red rock (ochre?) that I collected on a spring bear hunt. All were crushed up using mortar and pestle. I have some brighter colors, red, blue, and green, that I have made from the kids sidewalk chalk. Might have to make some flashier arrows with some of those colors next batch.