Coloring boos must be such as to cause a positive emotional response from the child, encourage him to draw further. For older children it is interesting to color a favorite fairy tale character, useful educational coloring.

It is believed that the company The McLoughlin Brothers (en.wikipedia.org/wiki/McLoughlin_Brothers) invented the coloring books. They published a book called The Little Folks' Painting Book in collaboration with Kate Greenaway in 1880.

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