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:
“Painting seems to be to the eye what dancing is to the limbs. When that has educated the frame to self-possession, to nimbleness, to grace, the steps of the dancing-master are better forgotten; so painting teaches me the splendor of color and the expression of form, and as I see many pictures and higher genius in the art, I see the boundless opulence of the pencil, the indifferency in which the artist stands free to choose out of the possible forms.”
—Ralph Waldo Emerson (1803–1882)
“As long as our people quote English standards they dwarf their own proportions.”
—Ralph Waldo Emerson (1803–1882)