Identificação de cores e cromática

501-36-59 Paint - General Information 501-36-59 DESCRIPTION AND OPERATION TO BE UPDATED LATER Subtractive color mixing means mixing the primary colors cyan, magenta and yellow to form a desired color (CMY colors). Subtractive color mixing is used when light should enter the eye of an observer after reflection from an object. Such as happens with painting or in printing. Oswald color circle TO BE UPDATED LATER The Oswald color circle is based on subtractive color mixing, and enables the behavior of paints when they are mixed together to be represented. Colors lying opposite each other are complementary colors and should not be mixed together as this will produce a dull (i.e. grey) shade. If green is added to red, the red becomes greyer, not greener. Color shades which are side by side are partner colors and produce a mixed color shade. For instance, mixing red and blue produces a pure violet. In addition, black and/or white may be necessary to produce a particular color shade. ‡ White makes the color shade lighter. ‡ Black makes the color shade darker. ‡ With black and white the color shade becomes more dreary or greyer. Metamerism Metamerism is the name of the effect which occurs when two colors appear identical in a particular light (e.g. artificial light), but the colors appear different under another light source (e.g. daylight). The cause is the fact that the human brain, aided by the eyes, does not evaluate the wavelength, instead it evaluates the spectral intensity of the reflected light. It is for this reason that color matching in practice must only ever be performed in daylight, or under special artificial light which is based on daylight. Metallic and pearl pigments Colored paints achieve their color effect by the addition of pigments. Pigments are colored, solid, very fine organic and inorganic particles which are insoluble in the binding material. Metallic pigments Aluminum platelets are added as pigment to form metallic paint.