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APHA color, also referred to as the Hazen scale, and more appropriately as the Platinum Cobalt(Pt/Co) scale, [1] is a color standard named for the American Public Health Association and defined by ASTM D1209. [2] It was originally intended to describe the color of waste water, but its usage has expanded to include other industrial applications ...
Marginal cases are allowed; for example, a star may be either a supergiant or a bright giant, or may be in between the subgiant and main-sequence classifications. In these cases, two special symbols are used: A slash (/) means that a star is either one class or the other. A dash (-) means that the star is in between the two classes.
In France, the rating is defined by the public tourist board (Atout France) using a four-star system (plus "L" for Luxus), which has changed to a five-star system from 2009 on. [5] In South Africa, the Tourist Grading Council of South Africa has strict rules for a hotel types granting up to 5 stars.
Arylide yellow, also known as Hansa yellow and monoazo yellow, is a family of organic compounds used as pigments. They are primarily used as industrial colorants including plastics, building paints and inks. They are also used in artistic oil paints, acrylics and watercolors. These pigments are usually semi-transparent and range from orange ...
The color mellow yellow is displayed at right. Mellow yellow was first used as a color name in English in 1948 when it was formulated as one of the colors on the Plochere color list. The source of this color is the Plochere Color System, a color system formulated in 1948 that is widely used by interior designers. [9]
The Platinum-Cobalt Scale (Pt/Co scale or Apha-Hazen Scale) is a color scale that was introduced in 1892 by chemist Allen Hazen (1869–1930). The index was developed as a way to evaluate pollution levels in waste water. It has since expanded to a common method of comparison of the intensity of yellow-tinted samples.
A platinum loop is moistened and dipped in a fine powder of the substance in question and borax. The loop with the adhered powders is then heated in a flame until it fuses and the color of the resulting bead observed.
The word yellow is from the Old English geolu, geolwe (oblique case), meaning "yellow, and yellowish", derived from the Proto-Germanic word gelwaz "yellow". It has the same Indo-European base, gel-, as the words gold and yell; gʰel-means both bright and gleaming, and to cry out.
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