Yellow pigment is a term used to describe a range of colors from light yellow to dark orange. OCHRE, orpin, ocher, gamboges, orpiment, etiolin and morin are all different types of yellow pigments. OCHRE is a natural earth pigment containing iron oxide and clay. Orpin is a yellow pigment made from the root of a plant. Ocher is a yellow-brown pigment made from clay and iron oxide. Gamboges is a yellow pigment made from the resin of a tree. Orpiment is a yellow pigment made from arsenic sulfide. Etiolin is a yellow pigment made from a plant extract. Morin is a yellow pigment made from the bark of a tree.