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I had assumed this was some sort of water colouring book like these (https://www.amazon.com.au/gp/product/B07FPQV791/), but it is in fact a watercolour book, where each page has a little dippable palette that your child can then proceed to paint with.
Anyway, for AU$4 it was good price and good idea - just be sure to have somewhere separate to stash a paintbrush and rinse off colours in between if you intend to take this travelling with you