Colored pigments were mixed onto a trowel and spread over a fresh lime plaster on this straw bale wall. A salt shaker with enlarged holes was also used to shake pigments onto the lime before troweling. You can purchase small sacks or jars of pigment but be sure they are lime soluable. Otherwise the pigments will not mix, and will remain as 'pepper specks' in the mix. Pigments are often mixed with tepid water first, then added to the lime putty before application. Pigments can be expensive, so they are often used only on the top coat layer, or are used as a lime wash only to give color.