A coloring book (or colouring book) is a type of book containing line art to which a reader may add color using crayons, colored pencils, marker pens, paint or other artistic media. Coloring books are generally used by children, though coloring books for adults are also available. Traditional coloring books and coloring pages are printed on paper or card. Some coloring books have perforated edges so their pages can be removed from the books and used as individual sheets. Others may include a story line and so are intended to be left intact. Today many children's coloring books feature popular cartoon characters. They are often used as promotional materials for animated motion pictures. Coloring books may also incorporate other activities such as connect the dots, mazes and other puzzles. Some coloring books also incorporate the use of stickers.
Paint books and coloring books emerged in the United States as part of the "democratization of art" process, inspired by a series of lectures by British artist Joshua Reynolds, and the works of Swiss educator Johann Heinrich Pestalozzi and his student Friedrich Fröbel. Many educators concluded that all, regardless of background, students stood to benefit from art education as a means of enhancing their conceptual understanding of the tangible, developing their cognitive abilities, and improving skills that would be useful in finding a profession, as well as for the children's spiritual edification. The McLoughlin Brothers are credited as the inventors of the coloring book, when, in the 1880s, they produced The Little Folks' Painting Book, in collaboration with Kate Greenaway. They continued to publish coloring books until the 1920s, when the McLoughlin Brothers became part of the Milton Bradley Company.
Another pioneer in the genre was Richard F. Outcault. He authored Buster's Paint Book in 1907, featuring the character of Buster Brown, which he had invented in 1902. It was published by the Stokes Company. This launched a trend to use coloring books to advertise a wide variety of products, including coffee and pianos. Until the 1930s, books were designed with the intent for them to be painted instead of colored. Even when crayons came into wide use in the 1930s, books were still designed so that they could be painted or colored.
Coloring books are widely used in schooling for young children for various reasons. For example, children are often more interested in coloring books rather than using other learning methods; pictures may also be more memorable than simply words.
As a predominately non-verbal medium, coloring books have also seen wide applications in education where a target group does not speak and understand the primary language of instruction or communication. Examples of this include the use of coloring books in Guatemala to teach children about "hieroglyphs and Mayan artist patterns", and the production of coloring books to educate the children of farm workers about "the pathway by which agricultural pesticides are transferred from work to home." Coloring books are also said to help to motivate students' understanding of concepts that they would otherwise be uninterested in.
They have been used as teaching aids for developing creativity and knowledge of geometry, such as in Roger Burrows' Altair Designs.
Since the 1980s, several publishers have produced educational coloring books intended for studying graduate-level topics such as anatomy and physiology, where color-coding of many detailed diagrams are used as a learning aid. Examples include The Anatomy Coloring Book and subsequent book series, by Wynn Kapit and Lawrence Elson, published by HarperCollins (1990s) and Benjamin Cummings (2000s).
Some publishers have specialized in coloring books with an explicit educational purpose, both for children and for adults. The books will often have extensive text accompanying each image. Examples of publishers include Dover Books, Really Big Coloring Books, Running Press, and Troubador Press.
Health and therapeutic uses
Coloring books have seen wide application in the health professions as educational tools. One nurse, trying to limit the trauma of child surgery, described in an academic publication how the use of a coloring book "might help [the child] to understand what was going to happen to him." They are also used in rehabilitation of accident victims to aid recovery of hand–eye coordination, and they are used with autistic children both for entertainment and for their soothing effect. One of the appeals of adult coloring books is that they help users relax and de-stress.
In August 2011 American Publisher Really Big Coloring Books released "We Shall Never Forget: The Kids Book of Freedom" detailing specific drawings in the accounting of SEAL Team 6 shooting Osama bin Laden in his home. The book was criticized by some for portraying Muslims in a negative manner.
Coloring books have been used for political purposes. In 1968 the Black Panther Coloring Book began circulating in the United States; the book features black men and children killing pigs dressed as police officers. It was argued to have been made not by the Black Panther Party but by the Federal Bureau of Investigation's COINTELPRO program to discredit the organization, a claim which other sources dispute.
The term and concept of the "coloring book" was adopted by the feminist artist Tee Corinne as a tool of female empowerment. Corinne made pencil sketches of female genitalia, which she then inked and printed on card stock. She published a collection of them in 1975 as The Cunt Coloring Book.
|“||No other name seemed really to fit, although the word "cunt" was not one with which I was particularly comfortable. The alliteration, though, was nice. I also liked the idea of combining a street term for genitalia with a coloring book, because both are ways that, as children, we get to know the world.||”|
Photographer Jno Cook produced line drawings based on Robert Frank's The Americans, and published them in a limited edition as the Robert Frank Coloring Book. the National Gallery of Art used the images as party favors for writers working on the catalog of a retrospective of Frank's work.
Adult coloring books
Beginning in 2015 coloring books for adults began increasing in popularity. In April of that year two such coloring books became the top sellers at Amazon  By November it was reported by Amazon.ca that the books were a top wished for item with 9 out of the top ten consisting of such books.  Also that month Crayola began offering their own line of adult coloring books. 
Adult coloring books, though available in print, are increasingly being offered digitally, via ebooks, digital apps, and coloring pages that can be colored online or downloaded. Contributing to the popularity of e-coloring books are their de-stressing, relaxation effects and the fact that users' work-products can be saved and shared. Writing for the Washington Post, Dominic Bulsuto theorized that the trend of digital purchasing helped the spread of the genre noting that the relative anonymous nature of the act allowed customers to feel more secure persuing books they would be embarrassed to buy in real life. 
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- Liszewski, Andrew. "Crayola Now Has Its Own Line of Coloring Books For Adults". Gizmodo. Retrieved 10 November 2015.
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|Wikimedia Commons has media related to Coloring books.|
- Wikijunior Coloring Book at Wikibooks