Yeah lets be honest this is the dirty secret about ID. A lot of the materials we use have such varied an amazing qualities: grip, texture, detail, color, economics, but atleast from my experience they are all toxic and less than ideal for the environment. I actually did work in school on injection molding bio resins. Given that was 7 years ago things may have changed. What i found was some good resins but most were either too expensive, couldnt retain pigment, had major mold flow issues or just ended up looking terrible.
Sorry less than helpful!