Kapoor didn’t invent shit. He bought sole rights to use the medium in art (no loss at all to the art world for which it is not especially useful) and that’s just a dickish thing to do. Kapoor has always been a dick though. Stuart Semple’s Culture Hustle made acrylic pigments that eat almost as much light and are safe to use. Culture Hustle has a lot of neat stuff for artists and hobbyists.