Red, orange, yellow and brown are warm colors, symbolizing the sun, the flame and the earth. Green, blue and purple are cool colors, symbolizing: forest, sky and sea. Black, gray and white are intermediate colors.

The higher the brightness of a cool tone, the warmer it is. Cool colors are cyan, blue, purple and their cool colors. Cool colors have a contractive effect on vision.

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Gouache pigments are mostly opaque and consist of powdery materials, which are fixed with glue and have strong coverage. So when you draw gouache, you often start with the darkest color.

Gouache pigments can be covered layer by layer. If you are patient, you can draw the same effect as an oil painting, but the color of the pigment will become darker when it is wet and lighter when it is dry.

There are also purplish colors such as rose red and violet, which are easy to turn out. So don't use it as a primer. Gouache pigment has very fine color particles, and the color is beautiful after being dissolved in water, but it can't cover the background color. The colors of ultramarine, ochre and earth red in watercolor pigments belong to mineral pigments, which are easy to precipitate when used alone or mixed with other colors.

Color can give people the feeling of "light and heavy"; White and yellow give people a lighter feeling, while red and black give people a heavier feeling. In home decoration, the top of the room (ceiling) is easy to choose light color or bright color; The wall and the ground can be properly weighted, otherwise it will give people a top-heavy feeling.