Shinehah Bigham is not your typical outdoor enthusiast. Exploring local watersheds through every season for decades, Bigham is skilled at recognizing natural materials called “earth pigments” that she ...

Ochres, iron oxides, and earth pigments are humankind’s oldest art material. For ochre researcher and artist Heidi Gustafson, they are also an invitation to challenge how we interact with the ...

Early Earth might have shimmered in shades of purple, not green, according to the Purple Earth Hypothesis. Researchers propose that before chlorophyll-based photosynthesis, ancient microbes using ...