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H and D curve

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noun Photography.
  1. characteristic curve.
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Origin of H and D curve

after Ferdinand Hurter (1844–98), Swiss chemist, and Vero Charles Driffield (1848–1915), English chemist, who jointly descibed it in 1890
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018