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An 1895 mechanical color wheel, used for experiments with color vision A mechanical four-petal (red, green, blue, white) color wheel inside a 1998 digital light processing (DLP) video projector A color wheel or other switch for changing a projected hue (e.g., for an optical display) is a device that uses different optics filters or color gels ...
Cleaning agents are substances (usually liquids, powders, sprays, or granules) used to remove dirt, including dust, stains, bad smells, and clutter on surfaces. Purposes of cleaning agents include health, beauty, removing offensive odor, and avoiding the spread of dirt and contaminants to oneself and others.
A color wheel or color circle [1] is an abstract illustrative organization of color hues around a circle, which shows the relationships between primary colors, secondary colors, tertiary colors etc. Some sources use the terms color wheel and color circle interchangeably; [ 2 ] [ 3 ] however, one term or the other may be more prevalent in ...
The Color Harmony Manuals were published beginning in 1942, and have been out of print since 1972. [2] Ostwald's first Color Harmony Manual was a set of 12 handbooks showing complementary hues. The first edition was published in 1942. It contained 680 color chips. Each color chip was a 5/8 inch square and had a tab where the Ostwald notation ...
Box of Blanco blocks on display at the Imperial War Museum North. Blanco was a compound used primarily by soldiers throughout the Commonwealth from 1880 onwards to clean, colour (and thus camouflage), and waterproof their equipment as well as reduce its stiffness. [1]