Questions & Answers

You can get a very cheap ball mill by buying a National Geographic rock tumbler for kids, then using 4mm ceramic balls found on Amazon.com. Excellent for wet milling. I believe I am getting particle sizes less than 10 microns after 8 hours of milling. It runs in the corner of the kitchen, and it doe

There's a lot of research lately about ancient people roasting yellow ochre to turn it red. That makes sense if there's no red ochre available, but my question is why would anyone do this when there's red ochre already available nearby? I have my own hypothesis, but I'd like to hear what others thin