...In unfavorable cases blood vessels form andare seen to traverse the affected part from periphery to center, vision becomesentirely lost, and permanent opacity (albugo or leucoma) remains... 
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...Transparency and opacity constitute another contrast of colouring, theformer of which belongs to shade and blackness, the latter to light andwhiteness...
George Field 「Field's Chromatography」
...As excellencies, therefore, transparencyand opacity are relative only—the first being as indispensable to shadein all its gradations, as the latter is to light...
George Field 「Field's Chromatography」
...Hence this red is preferablyemployed where opacity is to be avoided—in sunset clouds for instance...
George Field 「Field's Chromatography」
...Of greatbody, weight, and opacity, it is a somewhat slow drier; and does notretain that brilliancy when dry, which is peculiar to it while wet...
George Field 「Field's Chromatography」
...It possesses also, less opacity, and is not a compound...
George Field 「Field's Chromatography」
...It affords clear bright tints in skies and distances,but is apt to cause opacity if brought too near the foreground, and toassume a violet tinge by artificial light...
George Field 「Field's Chromatography」
..."The general failing in therepresentation of the sea is, that instead of appearing liquid and thin,it is made to bear the semblance of opacity and solidity...
George Field 「Field's Chromatography」
...It isof a darker colour than Indian red, which has also been classed amongpurples, but has a similar body and opacity, and generally resemblesthat pigment...
George Field 「Field's Chromatography」
...With us, at least,tungstate of baryta is far from having the body of white lead, andindeed is inferior in opacity to good zinc white...
George Field 「Field's Chromatography」
...And under that mattress of pale opacity the tankscrawled heavily...
Victor Rousseau 「Astounding Stories of Super-Science January 1930」
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