orthochromaticadj.n.
/ˌɔːθəʊkrəˈmatɪk/, U.S. /ˈˌɔrθoʊkrəˈmædɪk/ 1. Photography. Representing colours in their correct relations, i.e. without exaggerating the deepness of some and the brightness of others; spec. designating black-and-white film, plates, emulsions, etc., having a sensitivity which is more nearly uniform throughout the visible range than that of silver halide used alone, but which is relatively low in the red and high in the blue part of the spectrum (cf. panchromatic adj. 1). Also as n.: an orthochromatic plate.
ΘΚΠ
the world > matter > colour > colour relationships > [adjective] > true relationship
orthochromatic1887
society > leisure > the arts > visual arts > photography > a photograph > qualities and effects > [adjective] > other qualities and effects
orthochromatic1887
1887 Athenæum 26 Mar. 421/1 The colours were purposely selected to test as severely as possible the capacity of the plate used—a Dixon's orthochromatic.
1888 Science 28 Dec. 330/2 The constant attention Professor Rowland has given to photographic methods, and..his skill in making dry plates, simple and orthochromatic.
1889 Pall Mall Gaz. 21 Aug. 7/1 We want photography to be orthochromatic, or colour-correct.
1903 A. Payne Pract. Orthochrom. Photogr. vi. 88 Orthochromatic plates possessing additional sensitiveness to the yellow and green rays only may be handled in a red light possessing abrupt absorption.
1944 Electronic Engin. 16 326/1 It is essential to use either an orthochromatic or panchromatic emulsion.
1970 Amateur Photographer 11 Mar. 60/1 As positive film is orthochromatic (that is, it is not sensitive to the red component of the visible spectrum), it can be handled under a red photographic safelight.
1999 Guardian 21 May (Friday Review section) 11/1 Deep focus had been used in early silent movies when the fast orthochromatic stock was available.
2. Histology and Biology. Exhibiting or characterized by staining of the same colour as that of the stain used. Cf. metachromatic adj. 2.
ΘΚΠ
the world > life > biology > substance > staining quality of substance > [adjective]
basophil1890
neutrophil1890
neutrophilic1893
oxyphil1893
oxyphilous1893
basophilic1894
basophilous1894
metachromatic1894
polychromatophilic1897
polychromatophil1898
chromophil1899
chromophilic1899
chromophobic1899
orthochromatic1899
polychromatic1899
pycnomorphous1899
fuchsinophil1900
neutrophilous1900
carminophilous1901
chromatoid1901
oxyphilic1901
pyknotic1902
sudanophil1902
chromaffin1903
metachromic1908
chromophobe1909
phaeochrome1909
sudanophilic1909
trachychromatic1909
polychromasic1911
chromaffinic1913
osmiophilic1923
osmophile1923
Feulgen-negative1928
fuchsinophilic1931
heteropycnotic1934
osmophilic1936
isopycnotic1950
Feulgen-positive1954
1899 Jrnl. Royal Microsc. Soc. 379 Orthochromatic macrocytes which are without nuclei and appear late in embryonic life and in anæmia.
1930 A. A. Maximow & W. Bloom Text-bk. Histol. v. 114 In this way erythroblasts arise in which the protoplasm is purely acidophil, and stains a bright pink with the Romanowsky mixture. These cells are called orthochromatic erythroblasts or normoblasts.
1953 A. G. E. Pearse Histochem. vii. 152 Serial sections of an ovarian ‘pseudomucinous’ cystadenoma have been stained... Zone C contains connective tissue (collagen) fibres which are orthochromatic with toluidine blue.
1971 Cancer Res. 31 505/1 This behavior was paralleled by a shift in the pH of the transition from orthochromatic to metachromatic staining of the nucleus after methanol fixation.
1998 Proc. National Acad. Sci. U.S.A. 95 14672/1 Assuming..a range of 105–107 red cells at the proerythroblast through orthochromatic stage.., it would appear that as many as several hundred to several thousand ζ-GH mRNAs exist in each expressing adult erythroid cell.
This entry has been updated (OED Third Edition, September 2004; most recently modified version published online March 2022).
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adj.n.1887