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In color theory, a shade is a pure color mixed with black. It decreases its lightness while nearly conserving its chromaticity. Strictly speaking, a "shade of black" is always a pure black itself and a "tint of black" would be a neutral gray. In practice, many off-black colors possess a hue and a colorfulness (also called saturation).
A block of the periodic table is a set of elements unified by the atomic orbitals their valence electrons or vacancies lie in. [ 1] The term seems to have been first used by Charles Janet. [ 2] Each block is named after its characteristic orbital: s-block, p-block, d-block, f-block and g-block . The block names (s, p, d, and f) are derived from ...
Chromium is a chemical element; it has symbol Cr and atomic number 24. It is the first element in group 6. It is a steely-grey, lustrous, hard, and brittle transition metal. [ 7] Chromium metal is valued for its high corrosion resistance and hardness.
Black oxide or blackening is a conversion coating for ferrous materials, stainless steel, copper and copper based alloys, zinc, powdered metals, and silver solder. [ 1] It is used to add mild corrosion resistance, for appearance, and to minimize light reflection. [ 2] To achieve maximal corrosion resistance the black oxide must be impregnated ...
Carbon black (Color Index International, PBK-7) is the name of a common black pigment, traditionally produced from charring organic materials such as wood or bone. It appears black because it reflects very little light in the visible part of the spectrum, with an albedo near zero. The actual albedo varies depending on the source material and ...
Chemical coloring of metals is the process of changing the color of metal surfaces with different chemical solutions. The chemical coloring of metals can be split into three types: electroplating – coating the metal surface with another metal using electrolysis. patination – chemically reacting the metal surface to form a colored oxide or salt.
The lanthanide ( / ˈlænθənaɪd /) or lanthanoid ( / ˈlænθənɔɪd /) series of chemical elements [ a] comprises at least the 14 metallic chemical elements with atomic numbers 57–70, from lanthanum through ytterbium. In the periodic table, they fill the 4f orbitals. [ 2][ 3][ 4] Lutetium (element 71) is also sometimes considered a ...
The CMYK color model (also known as process color, or four color) is a subtractive color model, based on the CMY color model, used in color printing, and is also used to describe the printing process itself. The abbreviation CMYK refers to the four ink plates used: c yan, m agenta, y ellow, and k ey (black).