"The golden age" of coloring books is believed to be 1960-s, because almost all characters were depicted in them, as well as some products (like Planter Peanuts or Campbell Soup)

Coloring pencils or markers are useful for the development of fine motor skills. After painting the small objects, the child learns not to go beyond the boundaries of the drawing and trace the thin lines.

Groundhog Day Coloring Pages Kids