The question of the color of the substance, what is the reason why the substance has a color

There are two types of colors seen by the human eye, one is transmitted light and the other is scattered light.

When we look at solutions such as Coca-Cola, wine, vinegar, etc., what we see is actually transmitted light, so what we see is the color that is absorbed by the solution and complemented by the color.

When we look at metals, solids, and powder-filled objects, most of them see scattered light, and the color we see is the color of reflected light.

When the temperature is low, the molecules of the oil do not change, but the connection between the molecules changes, and it will change from liquid to solid. A change in the way the parts are linked leads to a change in color (change in refractive index, change in scattering index, change in absorption of light).

So, when you see transmitted light, it's really a complementary color, but when you take out the solid, you see scattered light, and it's not a complementary color.

The atomic structure of matter generally does not change unless there is a nuclear change (such as fusion). Fission. radiation, etc

The molecular structure is estimated to have remained unchanged.

If it changes, a chemical reaction will occur.

What may change is the structure of the molecular arrangement.

From liquid to solid or glassy.

The arrangement of the molecules changes and the absorbed light also changes.

So the color changes.

Because the state of the oil changes, the molecules also change, and the color reflected is different.

Just as things go bad, the color changes.

No, it's not the molecules of the oil that change.

Matter has a color, you can tell me what matter in front of you has no color, there are exceptions, of course, air, maybe not!

The color of an object is because the object reflects light of that color, in other words, the object does not absorb light of that color. The principle of color of matter: When a substance (molecule or ion) absorbs electromagnetic waves with considerable visible light energy, it will exhibit a color that can be perceived by the human eye.

The reason why a substance has a different color is the result of its selective absorption of visible light at different wavelengths.

The color of matter is related to the color of the light it absorbs. For example, when the white light passes through the copper sulfate solution, the copper ions selectively absorb part of the yellow light, so that the blue light in the transmitted light cannot be completely complementary, so the copper sulfate solution appears blue. Since the light of other colors in the transmitted light is still white in pairs, the color of the substance is precisely the complementary color of the light it absorbs.

If the substance absorbs all the light of all colors in the white light, it appears black; If it reflects all colors of light, it appears white; If the light passes through all colors, it is colorless.

In addition, the depth of the color of the solution depends on the amount of light absorbed by the solution, that is, it depends on the concentration of the absorbent substance, for example, the higher the concentration of copper sulfate solution, the more yellow light is absorbed, and the stronger the blue light transmitted, the darker the blue of the solution. Therefore, it is possible to determine the amount of absorbent substances in the solution by comparing the shade of the color of the solution (this is the basis of colorimetric analysis).

Antique White Beige Orange Black White Apricot Blue Violet Brown Solid Wood Army Blue Yellow-Green Coral Chrysanthemum Blue Beige Dark Crimson Cyan Dark Blue Dark Cyan Dark Golden Dark Gray Dark Green Dark Tawny Dark Magenta Dark Olive Green Dark Orange Dark Purple Dark Red Dark Flesh Dark Sea Blue Dark Gray Blue Dark Green Dark Sapphire Green Dark Violet Dark Pink Dark Sky Blue Dark Gray Flash Blue Fire Brick Flower White Forest Green.

Here are some common substances that change color or undergo color change when they come into contact with water:

1.Phenolphthalein indicator: Phenolphthalein is a commonly used acid-base indicator, which is colorless in an acidic environment and turns pink in an alkaline environment.

2.Methyl Orange Indicator: Methyl orange is another commonly used acid-base indicator that appears red in acidic environments and yellow in alkaline environments.

3.Metal Ion Indicator: Certain metal ions can form coordination compounds that change color when in contact with water. For example, the reaction of copper ions with water results in the formation of blue [Cu(H2O)6]2+ ligands.

4.Food colorants: Some food colorants dissolve or undergo a chemical reaction when exposed to water, and Kirihashi is changing color. For example, methyl blue, which is sold blue, turns green in water, and Sudan dye, which is red, turns orange in water.

5.Humidity indicators: Some humidity indicators can change color by absorbing moisture and are used to detect humidity levels in a closed system. For example, blue silica gel desiccant will turn pink or transparent when it absorbs moisture.

It is important to note that the discoloration of a substance is caused by its chemical or physical properties in contact with water. These changes are often used for indication or testing in laboratories, medical or food industries.

Eggplant purple ivory white.

Sapphire blue, sky blue.

Pastoral green silk satin white.

Champagne gold, rust red.

Dolphin Silver Moonshine Silver.

Carmine Lake water blue.

Rose purple apple only pats green.

Tartrazine. Ivory white.

Sapphire blue, sky blue.

Pastoral green silk satin white.

Champagne gold, rust red.

Dolphin Silver Moonshine Silver.

Carmine Lake water blue.

Rose purple Apple green.

Lemon refers to the big envy of lemon yellow.

Emerald green.

Agate Red Fiery Red.

Grass green, silver gray.

Sky blue, ebony black.

Mercerized brown amber orange.

Pitch black, blue.