Jisho

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水色標準液
Wikipedia definition
1. Forel-Ule scaleThe Forel-Ule Scale is a method to approximately determine the color of bodies of water, used in limnology and oceanography. By means of mixing different chemical (The standard solutions are made with distilled water, ammonia, copper sulphate, potassium-chromate and cobalt-sulphate) a color palette is produced in a series of numerically designated vials (1-21) which is compared with the color of the water body.
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