Black paint does not need to be adjusted, because black and white do not belong to the color system and cannot be adjusted, but the three primary colors can be adjusted to any color, that is, except black and white, gray can be directly added with black and white, or three primary colors can be used.

In fact, these are the basic theories of color matching, and black can't be adjusted. If you use color paste and varnish, even if it is adjusted, its hiding power will not work.

Black paint or Japanese varnish refers to a transparent paint which is mixed with pigment and oil paint to produce luster and accelerate drying. This pigment is used to decorate handicrafts, such as painting on tin ware, but it is too brittle to be used in creative painting.

Second, it refers to a cheap decorative enamel, which always contains asphalt, so it is usually black or transparent brown-black, also known as asphalt black or black Japan.

Extended data:

This kind of enamel, whether dry or not, has been widely used in Japanese lacquered black tin-iron utensils. A color, also called Japanese color, contains oil-free resin, which dries quickly and has a dull surface.

Signature used for painting and decorative handicrafts, usually protected by durable paint.

Japanese desiccant is a kind of liquid solvent with strong drying ability, which usually contains resin as a protective layer for painting and handicraft signature. These products are not used for painting that requires durability.

References:

Baidu encyclopedia-black paint