Experimental principle of dance pigment

Experimental principle of dancing pigment: Because the density of milk is slightly higher than that of pigment, several water-based pigments can temporarily float on the surface of milk after being added. After adding detergent, because detergent is a liquid medicine with active molecules, it will spread rapidly because of the movement of molecules, which will drive the diffusion of pigment and the pigment will dance with it.

Pigment refers to a substance that can color an object. Pigments are soluble and insoluble, inorganic and organic. Inorganic pigments are generally minerals. Humans have long known that inorganic pigments are used to paint on rock walls and paint the body with colored soil and minerals. Organic pigments are generally taken from plants and marine animals, such as indigo, gamboge and purple extracted from shellfish in ancient Rome.

Mainly used in paint, ink, printing and dyeing, plastic products, paper, rubber products and ceramics. With the rapid development of downstream industries and the increasing demand for pigments, the development prospect of China pigment industry is very broad.

20 1 1 year, the total import and export of dyes and organic pigments in China showed a downward trend. Among them, the export of dyes was 243,000 tons, a decrease of10.7% over the previous year; Foreign exchange earned by export was11.80 billion USD, up by 0.4% over the previous year. The export of organic pigments was 6.5438+500,000 tons, down by 2.7% over the previous year.

Pigments usually have the following characteristics:

Color. Color pigment is a kind of pigment that selectively absorbs and scatters visible light energy, and can appear yellow, red, blue and green under natural light.

The ability of colored pigments to absorb incident light. It can be expressed as a relative percentage of the coloring power of standard pigment samples.

Coverage ability. The ability of film-forming substances to cover the surface color of substrates. The color paint commonly used to cover 1 square meter contains grams of pigment.

Light resistance. The ability of a pigment to retain its original color under certain illumination. Generally, the eight-level system is adopted, and eight is the best.

Weather resistance. The ability of pigments to maintain their original properties under certain natural or artificial climatic conditions. Generally, a five-level system is adopted, with five being the best.