Review: For example, why do leather shoes shine brighter and brighter?

1. On Sunday, I couldn't help sighing when I saw my father's dusty leather shoes. Well, it seems that I should be a coolie again. I picked up my father's dusty leather shoes, painted them with shoe polish and polished them carefully, thus reappearing my youth. Why? I don't doubt it.

So I found a pair of new shoes and compared them with the old ones. I first touched the uppers of two pairs of leather shoes and found that the surface of the new shoes was smoother than the old ones.

I went to get a pair of old leather shoes, which looked uneven under the magnifying glass. Then I applied shoe polish to the rough areas 1 and 2 of the leather shoes, and wiped them carefully. The area 2 was not applied as a blank control. I found that the surface of 1 area was much smoother after wiping, and it was brighter than that of area 2 in the sun. Why is there such a big difference between them?

4. So I went to ask my father that the surface of leather shoes is not absolutely smooth. If they are old leather shoes, they are even more uneven, so that they can't reflect the light in a certain direction and look dim. And some small particles in shoe polish just fill the pits of leather shoes. If cloth shoe polish is used to make it more uniform, the surface of leather shoes will be smoother and more reflective.

Through the experiment, I finally know the secret of shoes getting brighter and brighter.