During offering this article (August 2015), one fourth of Amazon’s top twenty best-selling books are coloring in books. So what exactly is a grown-up coloring book, and how is it that they’re currently outselling top fiction authors with new releases for example E.L. James and Paula Hawkins? Adult coloring books are, plain and simply, coloring in books for grownups. Like children’s coloring books, they’re brimming with outline illustrations made to be completed with colored pencils,…
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