Colored pencil in the context of "Picture book"

Color (or colour in Commonwealth English) is the visual perception produced by the activation of the different types of cone cells in the eye caused by light. Though color is not an inherent property of matter, color perception is related to an object's light absorption, emission, reflection and transmission. For most humans, visible wavelengths of light are the ones perceived in the visible light spectrum, with three types of cone cells (trichromacy). Other animals may have a different number of cone cell types or have eyes sensitive to different wavelengths, such as bees that can distinguish ultraviolet, and thus have a different color sensitivity range. Animal perception of color originates from different light wavelength or spectral sensitivity in cone cell types, which is then processed by the brain.

Colors have perceived properties such as hue, colorfulness, and lightness. Colors can also be additively mixed (mixing light) or subtractively mixed (mixing pigments). If one color is mixed in the right proportions, because of metamerism, they may look the same as another stimulus with a different reflection or emission spectrum. For convenience, colors can be organized in a color space, which when being abstracted as a mathematical color model can assign each region of color with a corresponding set of numbers. As such, color spaces are an essential tool for color reproduction in print, photography, computer monitors, and television. Some of the most well-known color models and color spaces are RGB, CMYK, HSL/HSV, CIE Lab, and YCbCr/YUV.

Caran d'Ache (French pronunciation: [kaʁɑ̃ daʃ]) is a Swiss manufacturing company of art materials and writing instruments. The company, established in 1915, produces a wide range of products including colored pencils, graphite pencils, pastels, fountain pens, ballpoint pens, mechanical pencils, markers, gouache paints, and ink cartridges.

A blue pencil, also known as a checking pencil, is a two-color pencil traditionally used by an editor to correct a written copy. The blue end is typically Prussian blue, and the red end is typically a warm vermilion red.They are most often half red and half blue, but some are 70% red and 30% blue. An editor-in-chief would use a blue colored pencil to make proofreading marks and final notes on manuscripts before sending it to be typeset and published. The pencils and their blue excisions became associated with the editing process and editorial oversight.

Since the introduction of desktop publishing, editing is typically done on computer files and without literal blue pencils. They continue to be used in the Japanese newspaper industry and elementary schools in parts of Europe. A different type of non-photo blue pencil is used by some comics artists for different purposes.

Crayola LLC, formerly the Binney & Smith Company, is an American manufacturing and retail company specializing in art supplies. It is best known for its Crayola brand of crayons. The company is headquartered in Forks Township, Pennsylvania in the Lehigh Valley region of the state. Since 1984, Crayola has been a wholly owned subsidiary of Hallmark Cards.

Originally an industrial pigment supply company, Crayola soon shifted its focus to art products for home and school use, beginning with chalk, then crayons, followed later by colored pencils, markers, paints, modeling clay, and other related goods. All Crayola-branded products are marketed as nontoxic and safe for use by children. Most Crayola crayons are manufactured in the United States.