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?
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They have the paint under water soluble covering. when you apply water, the outer disolves and you then get the paint to fill the area
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.
When I was little, the single use ones had a dissolvable coating on the pages. When you applied water, the thinner white top mixed with the colored paint underneath to reveal color. This was not great because it meant my brush could pick up color which could then stain the carpet I was lying on, haha.
These days, some of the single use books have the underlying color printed with a method that isn’t water soluble.
The multi-use versions probably have a structured coating on the pages that scatter light in such a way that is canceled out by water. Have you ever picked up a pretty rock from the river or beach, only to be disappointed by how dull and white it looked once dry? The books use an extreme version of that
I have a few of these.
The colours are stored in the black lines and dots of the drawing.
The paints I assume are simple watercolours that dissolve and get spread across the page.
My Little Mermaid one I had as a kid had a very fine and widely spaced dot matrix over the image and the dots contained water soluble dye.
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