Great 2-part article discussing the complex issue of federal regulations, tribal standards, pigments, PCBs and the Spokane River.

Part 1: http://crosscut.com/2015/10/dangerous-colors-and-the-poisoning-of-the-spokane-river/

Part 2: http://crosscut.com/2015/10/what-will-it-take-to-clean-up-a-poisoned-river/