Such a method of
reproducing a small impression of an old work, is peculiarly
applicable to mathematical tables, the setting up of which in
type is always expensive and liable to error, but how long ink
will continue to be transferable to stone, from paper on which it
has been printed, must be determined by experiment. The
destruction of the greasy or oily portion of the ink in the
character of old books, seems to present the greatest impediment;
if one constituent only of the ink were removed by time, it might
perhaps be hoped, that chemical means would ultimately be
discovered for restoring it: but if this be unsuccessful, an
attempt might be made to discover some substance having a strong
affinity for the carbon of the ink which remains on the paper,
and very little for the paper itself.(2*)
103. Lithographic prints have occasionally been executed in
colours. In such instances a separate stone seems to have been
required for each colour, and considerable care, or very good
mechanism, must have been employed to adjust the paper to each
stone. If any two kinds of ink should be discovered mutually
inadhesive, one stone might be employed for two inks; or if the
inking-roller for the second and subsequent colours had portions
cut away corresponding to those parts of the stone inked by the
previous ones, then several colours might be printed from the
same stone: but these principles do not appear to promise much,
except for coarse subjects.
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