Handprint's beautiful pigment color wheel.

This is a site of someone who spent years trying to give new artists the information they need to build their own palette with incredibly detailed pigment information and never asked anything in return.

He talks about watercolor, but this information is relevant to watercolor, oils, acrylics, gouache, pastel, colored pencil

I know some people here know about this site, but for anyone who doesn't, his wheel is hidden in the site somehwere that's not that evident.

http://www.handprint.com/HP/WCL/water.html