What do CG and BG in marker mean?

Cg is coolgray. Different from warmgray of wg, cool gray is suitable for representing the regular surface materials of flat plates, such as steps and building sides. Warm ash is suitable for expressing the facade of the building with the light-receiving surface, as well as the rubble in the landscape garden. Although this is not completely absolute, experts often match warm ash and cold ash well and complement each other.

Bg and gg are self-contained gray, and blue gray and green gray can be simply understood as the "graying" caused by the gradual change of blue sky and green forest in the distance, that is, the color produced by the less air transparency. Because these colors appear in many places in nature, we should use them with special care to get accurate expression.

Extended data:

The pigment of marker pen is volatile and can be used for quick drawing at one time. It is often used to design articles, advertising slogans, posters or other artistic creations. You can draw thick lines with little change.

Markers are generally divided into oil and water. The former pigment can be diluted with toluene, which has strong permeability and is especially suitable for painting on tracing paper (sulfuric acid paper). The latter pigment is soluble in water and is usually used for painting on cardboard or coated paper. In the drawing of indoor perspective, oily marker is commonly used. The technology of oily marker pen is also emphasized here.

There are many colors of marker pens, usually as many as hundreds. The distribution of colors is divided into several series according to common frequency, some of which are commonly used gray series with different color levels, which is very convenient to use. Its nib generally has a variety of thicknesses, and lines with different thicknesses can be drawn according to the different angles of the nib.

Baidu encyclopedia-mark