Not all painters use color palettes. The stippling painter Shura used tin covers instead of color palettes; Picasso flirted in the newspaper. In addition, using glass as the color palette has two advantages: first, to prevent the unused pigment from drying and scaling, the glass plate can be immersed in water for storage after use. The other is to replace the backing under the glass plate (white paper, gray paper or linen, etc.) according to the background color of the picture. However, the glass plate must be placed on a flat and stable support.