...And, lastly, a process which—however satisfactory it may be in other respects—impairs the undoubted permanency of a black-developed print is not one worthy of adoption... 
John A. Tennant 「Bromide Printing and Enlarging」
...If not washed long enough, the yellow of the ferricyanide will remain in the print, robbing its gradations of brightness and purity of color and impairing the permanency of the print...
John A. Tennant 「Bromide Printing and Enlarging」
...Other colours there are which have been brought forward within the lastfew years, not possessing the absolute permanency of the five foregoing,but equal, or superior, to many formerly used...
George Field 「Field's Chromatography」
...Is a deep-toned gorgeous yellow, affording richer tints than most otheryellows, but it cannot be depended on for permanency, and therefore isseldom employed...
George Field 「Field's Chromatography」
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