residual

Definition: Low levels of a contaminant or defect which may be acceptable in practice. * E.g. ~ aberrations, ~ noise: uncorrected defects in image formation or capture which are of a sufficiently low level not significantly to impair performance; ~ hypo: permissibly low concentration of fix left in film or print. Not all contaminants are bad Far from being bad to leave some residual fix or hypo behind in the final film or print, there is evidence that it is bad for the gelatine to be entirely free of hypo as it may help strengthen the structure -- so long as you do not leave so much fix behind that the sulphur can cystallise out. So, all ye who washed your precious films for hours to extract the last atom of thiosulphate may weep into your sinks. The moral: if it's too hard, it may be okay not to try.

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