During scripting this article (August 2015), one fourth of Amazon’s top twenty best-selling books are coloring in books. So what is a adult coloring book, and exactly how do they may be currently outselling top fiction authors with new releases like E.L. James and Paula Hawkins? Adult coloring books are, plain and simply, coloring in books for older people. Like children’s coloring books, they may be brimming with outline illustrations meant to be completed with…
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