"Fading Formation Awards"

By the way, August 25, 2020

Japan 2025 Osaka · Kansai World Expo

(Referred to as "Osaka World Expo")

The benchmark

let's see

The emblem stands out from more than 5,000 works

What

Xiaobian said I really want to know what other eliminated works look like

Picture source: Reference materials [1]

The mascot that was disclosed in the following (March 22, 2022)

It's even more blind everyone's eyes ...

Don't come over!

Until recently, I saw a picture on the Internet

Good guy

All the red parts disappear.

Is this not the sun?

Or was it destroyed by ultraviolet rays?

Okay, no kidding

Observe the picture carefully

I can still see a little outline faintly

Disappear red

It is because it is easy to be tanned by the sun

So take this opportunity

Let's take a look

What kind of operation

Can let the color disappear

In fact, the essence of fading is a chemical reaction, which makes the original non -ferrous substances into a new colorless substance. However, there are many ways to trigger these chemical reactions.

Chemistry chemistry method

1 red

Friends who have studied high school chemistry should be familiar with Pinhong. When we pass the sulfur dioxide (SO2) gas to the red solution, we will find that the original red gradually disappears. But if we heated the liquid after heating and fade, we will find that red appears again.

The principle of sulfur dioxide fading in the red solution

Photo source: Discipline [3]

Sulfur dioxide (SO2) will first react with water (H2O) reactions to generate sulfuric acid (H2SO3), and then react with red molecules, which changes the group in the lower right corner, which is the direct cause of the fading of the red solution. However, because the product is not stable, the primary material will be re -generated after heating, which will appear in color.

If we replace the gas (CL) in the gas (CL), then chlorine (CL) and water (H2O) will reflect to generate hydrogen chloride (HCL) and hydrochloride (HCLO). The hypochlorite has a strong oxidation, and its reaction with the red molecule generates a stable colorless product, so even if heated is heated, it cannot be reproduced.

Before and after the fading of the red solution

2 Asian armor blue

Armor blue is a kind of aromatic hybrid compound, which is used for chemical indicators, dyes, biological staining agents, and so on. The aquatic solution of Aja -based blue appears blue in the oxidized environment.

Armor Blue Structure | Picture Source: Reference Information [4]

If you want the subcontaneous blue, we must first dissolve a certain amount of glucose and sodium hydroxide in water, so that we get an alkaline glucose solution. At this time, we add a small amount of sub -armor blue to the alkaline glucose solution to dissolve it, and then static the solution.

At first, the solution was blue, and as the static time became longer, the blue would gradually become lighter. If we shake the bottle of solution at this time and make it full of contact with the air, the solution will change back to the original blue again.

Before and after the solution fades

This experiment is called the "Blue Bottle Experiment", and it uses the characteristics of the Asian armored blue in different environments.

The principle of the reaction is shown in the figure below. In the oxidized environment, the structure of the Asian Aja Blue is the structure shown on the right side of the picture; the glucose is restored, and the sodium hydroxide provides an alkaline environment, so that the response is proceeded to the left. New substances.

Blue Bottle Experimental Principle | Picture Source: Reference Information [5]

When we shake the solution, the solution is fully exposed to the oxygen in the air, which is once again oxidized into the original appearance. Experiments can be carried out repeatedly until the Aja Ki Blue is completely reacted.

Physics Physics Law

As mentioned at the beginning, the red gradually faded under the sun. So why did the purple part in the emblem fade? What is the reason for red fading?

We know that the reason why objects can show a certain color is because it reflects the light of this color and absorbs all the light of the other colors.

At the same time, we also know that the energy of light increases with the increase in frequency, which means that within the range of visible light, the energy of red light is the lowest and the energy of purple light is the highest.

The light wave band radiated by sunlight is basically visible light wave bands, including infrared and ultraviolet rays. Then the red part in the emblem pattern is to absorb the band except the red light wave segment, while the purple part absorbs the band except the purple light wave section.

From the perspective of absorbing light, the red part absorbs higher energy, while higher energy is more likely to destroy the chemical bonds in the dye molecules, making the group that can be presented in the color, which is damaged and loses the color.

In fact, the ingredients that have the main destructive effect on the pigment in the sun are ultraviolet rays, so the closer the color of the pigment color is closer to purple, the less likely to fade under the light.

Conclusion conclusion

Due to the limited space, Xiaobian could not list all the fade reactions one by one. However, from the above three examples, it can be seen that the color plays a very important role in our lives. At the same time, the wonderful transformation between the colors also makes us curious about this world.

Not to mention, Xiaobian is going to go to the chemistry room to start the reagents with colors (working ...)

Reference

[1] 2025 World Expo -wikipedia

[2] 2025 Osaka ・ Kansai World Expo mascot final result is released!The deformation monster inspired by "water capital" becomes logo vision [3] Zheng Tianlong, Zuo Xianghua. Sulfur dioxide experiment and theoretical research [J]. Chemistry education, 2017, 38 (9): 66-73.

[4] Armor Blue -Wikipedia

[5] Blue Bottle Experiment -Wikipedia

The pictures that are not marked in the article are derived from the Internet

Edit: Eric

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