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2. Coloring book - Wikipedia

   en.wikipedia.org/wiki/Coloring_book

   While coloring books for adults were popular in the early 1960s, those were satirical works rather than the therapeutic works that define the adult coloring book form today. [25] The first commercially successful adult coloring books were published in 2012 and 2013, [ 20 ] and began increasing in popularity in 2015.

3. Paint by number - Wikipedia

   en.wikipedia.org/wiki/Paint_by_number

   A paint by numbers kit. Paint by number or painting by numbers kits are self-contained painting sets, designed to facilitate painting a pre-designed image. They generally include brushes, tubs of paint with numbered labels, and a canvas printed with borders and numbers. The user selects the color corresponding to one of the numbers then uses it ...

4. List coloring - Wikipedia

   en.wikipedia.org/wiki/List_coloring

   For a graph G, let χ(G) denote the chromatic number and Δ(G) the maximum degree of G.The list coloring number ch(G) satisfies the following properties.ch(G) ≥ χ(G).A k-list-colorable graph must in particular have a list coloring when every vertex is assigned the same list of k colors, which corresponds to a usual k-coloring.

5. List of Crayola crayon colors - Wikipedia

   en.wikipedia.org/wiki/List_of_Crayola_crayon_colors

   All 16 Crayola Heads 'n Tails crayon colors. The eight Heads 'n Tails Crayons are double-sided and encased in plastic tubes that function much like the ones on Crayola Twistables. Each crayon has two shades of color, for a total of 16 colors, which are approximated by the background colors and hex RGB values below.

6. Human hair color - Wikipedia

   en.wikipedia.org/wiki/Human_hair_color

   Human hair color is the pigmentation of human hair follicles and shafts due to two types of melanin: eumelanin and pheomelanin. Generally, the more melanin present, the darker the hair. Its tone depends on the ratio of black or brown eumelanin to yellow or red pheomelanin. Melanin levels can vary over time, causing a person's hair color to ...

7. Complete coloring - Wikipedia

   en.wikipedia.org/wiki/Complete_coloring

   Therefore, the achromatic number of the Clebsch graph is 8. In graph theory, a complete coloring is a (proper) vertex coloring in which every pair of colors appears on at least one pair of adjacent vertices. Equivalently, a complete coloring is minimal in the sense that it cannot be transformed into a proper coloring with fewer colors by ...