Today I want to talk about the flowering "crystal tree", because I happened to play with this thing recently.

it is estimated that many people have seen this kind of crystal growth toy. It is usually a branch skeleton made of paper and set it up in a container. Then add a small packet of solution (or some may be made of solid salt by adding water), and then as long as you wait quietly, you can see the crystalline flowers on the "branch":

this principle is not complicated at all. It is a process of absorbing salt solution by capillarity and then evaporating solvent crystallization on the branch. The process of crystal growth still looks beautiful.

the crystal toys I bought are not marked with the composition of the solution, but according to my search, the crystal should be salts such as potassium dihydrogen phosphate. The crystal itself is colorless, and the effect of coloring like "cherry blossoms" is mostly dyed with pigment at the tip of the paper.

but what I actually want to sigh about is not the part of the crystal solution, but the paper used in the crystal tree. When I bought this toy, I thought it was a bit boring for everyone to make Christmas tree or cherry tree-shaped crystals, so I wanted to replace the paper in the toy package with a piece of paper with a pattern drawn by myself. the hair on the top of the piece of paper didn't crystallize.

(to be exact, I had planned to grow crystal hair on someone's head, but it was only then that I suddenly realized that the choice of paper was the most important factor affecting the effectiveness of the experiment. After 24 hours, ta was still bald.

. The water absorption of the paper is very important, if the water absorption is slow, then the solution is difficult to climb on the paper, and the crystal can only stay in the root position (this is the problem I encountered in the first place), and the filter paper which absorbs water very quickly is not easy to use, because the tip of the paper is not easy to dry in evaporation.

I randomly tried several kinds of paper at home, including coffee filter paper, cotton paper card, sketch paper and watercolor paper, and found that the results were not very satisfactory. Only the crystallization of cotton paper card was good, but this kind of paper jam was not strong enough after absorbing water, as a result, the crystal bent the paper. Thus, the choice of paper for this crystallization experiment is actually very critical, it is said that blotting paper (Blotting paper) will be a better choice, relatively thick and absorbent.

in addition to paper, another thing I tested worked surprisingly well, and that is the twist bar. To put it simply, it is a handmade material that looks like a mini test tube brush, with iron wire on the inside and dense fluff on the outside, just suitable for absorbing the solution and evaporating crystallization.

(this is the twist bar. )

I didn't take any pictures this time because the results are not satisfactory. Next, I'm going to make some blotting paper and try again. I hope it can be successful.

. The water absorption of the paper is very important, if the water absorption is slow, then the solution is difficult to climb on the paper, and the crystal can only stay in the root position (this is the problem I encountered in the first place), and the filter paper which absorbs water very quickly is not easy to use, because the tip of the paper is not easy to dry in evaporation.

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I randomly tried several kinds of paper at home, including coffee filter paper, cotton paper card, sketch paper and watercolor paper, and found that the results were not very satisfactory. Only the crystallization of cotton paper card was good, but this kind of paper jam was not strong enough after absorbing water, as a result, the crystal bent the paper. Thus, the choice of paper for this crystallization experiment is actually very critical, it is said that blotting paper (Blotting paper) will be a better choice, relatively thick and absorbent.

in addition to paper, another thing I tested worked surprisingly well, and that is the twist bar. To put it simply, it is a handmade material that looks like a mini test tube brush, with iron wire on the inside and dense fluff on the outside, just suitable for absorbing the solution and evaporating crystallization.

(this is the twist bar. )

I didn't take any pictures this time because the results are not satisfactory. Next, I'm going to make some blotting paper and try again. I hope it can be successful.