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:
“For the profit of travel: in the first place, you get rid of a few prejudices.... The prejudiced against color finds several hundred millions of people of all shades of color, and all degrees of intellect, rank, and social worth, generals, judges, priests, and kings, and learns to give up his foolish prejudice.”
—Herman Melville (1819–1891)
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—Andrea Dworkin (b. 1946)