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Offensive Crayons is a pen made by mixing paint in wax. Offensive Crayons is not permeable, is fixed on the picture by adhesion, is not suitable for the use of too smooth paper, board, also cannot be obtained by color repeated superposition composite color. It is an ideal tool for children to learn color painting, and some painters use it for sketching and color recording. A crayon made with compressed chalk, pigment powder, and adhesive. Paintings made with this kind of crayon are called colored crayon paintings. The traditional bonding material is astragalus gum. When the adhesive is linseed oil, the crayons are called oil chalk. Colored crayons are used to paint on rough paper, cardboard, or specially prepared canvas. Crayon paintings are easy to damage because they blur when touched. Color fixing agents can protect the image, but are not recommended because they darken the color.