I have bought coloring books for my son. The book has pages of pictures what turn to color after you brush it with wet sponge ar brush. How does it work?
Also, some of them are single use only – you get them wet, they stay colored. Other (more expensive ones of course) dry out and you can re-wet rhem again after some time. How does thaaat work?
In: Other
They’re a color image, with a layer of tissue paper glued on top. When you wet the tissue paper, it becomes more transparent, and the colors show through.
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