The basics Jacquard Pearl Ex Powdered Pigments are non-toxic pigments made from powdered mica, that exhibit extreme colorfastness, and won't rust or tarnish over time. The benefits Mix into any viscous medium like oil, acrylic, gouache, varnish, wax, paper pulp, or clay.  The uses Use them for collage and mixed media art, calligraphy, faux-finishing, sculpture, paper-making, printing, candle-making, pottery, or to add a lustrous glow to paintings, drawings, sculpture, stamping, jewelry, and more!  The bottom line Their temperature resistance allows them to be fired in a kiln up to 600°F (316°C). They may also be used dry and then sealed.