It's crayon day, established to commemorate the creation of the tool that most kids use to learn to write and draw. But the history of the crayon technique is an important one in the history of art. Almost 73,000 years ago, a human used a crayon, as a combination of wax, dirt, and pigment, to draw on a now-fragmentary stone. Thoughts, attitudes, memories, and emotions are expressed through the drawing of lines. Since the late 14th century, when plaster as a wet medium was colored, artists and laypersons experimented with tools that would not need a pot to dip out pigment. Instead, they would be consumed in the act of creation. The conte crayon, a French technique, was invented in the late 18th century as a mixture of graphite and clay. It became a hard pencil tool in limited colors of blue, black, and brown which could sweep color onto canvas. Alois Senefelder, in 1798, testing stone and moisture absorption, invented a process called lithography by sticking wax and lamp black to alternating sections of drawn greasy crayon.
In addition, charcoal crayons that have been deeply dipped in oil show a brownish streak left by the oil alongside the lines; this technique was used in the 20th century by the American artist Susan Rothenberg. The attempt to produce a crayon or pencil of the greatest possible uniformity has led to the production of special chalks for drawing; what we think of as "chalk," was invented as a form of crayon. Pastel chalks are particularly favoured for some portrait techniques; their effect approximates that of color-and-area painting rather than line drawing. But the effect of crayon -- that tool which is consumed as it creates -- remains. As the conte crayon evolved, purified, and washed, graphite could henceforth be made with varying admixtures of clay and in any desired degree of hardness. The hard points, with their durable, clear, and thin stroke layers, led to the graphite pencil, another form of crayon.
Artists' mediums on crayon emphasize the diversity of crayon outcomes: