Stroke is light color chalk works, with mouth blows can blow off many colors, so will the use of draw fluid is very important.

Crayon color is extremely rich, there are as many as more than 550 kinds of colors for choice. Can draw the tonal very rich picture, but generally 5-100 or so enough.

Crayon except used as color painting outside, still can be used for the drawing of colored paper improve light, many foreign classical masters are like this, such as door adopt such as true.