Color Standards
There a color standard, made from dilutions of a Pt-Co solution, described by Dr. A. Hazen in American Chemical Journal, in 1892, adopted in Standard Methods for the Examination of Water and Waste Water, made by APHA, sometimes referred as Pt-Co/Hazen/APHA Colour.
Read more about this topic: American Public Health Association
Famous quotes containing the words color and/or standards:
“It is never the thing but the version of the thing:
The fragrance of the woman not her self,
Her self in her manner not the solid block,
The day in its color not perpending time,
Time in its weather, our most sovereign lord,
The weather in words and words in sounds of sound.”
—Wallace Stevens (1879–1955)
“Chief among our gains must be reckoned this possibility of choice, the recognition of many possible ways of life, where other civilizations have recognized only one. Where other civilizations give a satisfactory outlet to only one temperamental type, be he mystic or soldier, business man or artist, a civilization in which there are many standards offers a possibility of satisfactory adjustment to individuals of many different temperamental types, of diverse gifts and varying interests.”
—Margaret Mead (1901–1978)