Patagonia is putting bug poop in its new clothing line. You heard that right.

In an effort to dye its clothes without using toxic chemicals, the green-minded apparel company is making its new Clean Color Collection with natural dyes sourced from 96 percent renewable resources. Those include dyes derived from the poop of silkworms, dried beetles and byproducts of food waste, Patagonia announced Thursday.

Why the alchemy? the company said in a press release about its new experiment. Because dye is dirty.