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II. Chemical expedients.
1. To the ingredient or ingredients poison
best suited to the purpose of colour in ordinary
cases, add another which being either
or at least not discharged by the menstrum by which
the ordinary colour would be capable of being
discharged, would in spite of the action of such menstrum remains to a certain sufficient degree
discernable. Probatum est.
2. In The In the composition of the paper, add an
ingredient of such a nature as by the change of
colour it would undergo would betray the action
of any menstrum capable of discharging the colour
of the ink or pigment.
By the discovery of that almost universal
destroyer of colour, the oxy-muriatic acid, the
value of the above mentioned indications is however much
reduced.
Of chemical expedients in general it may
moreover be observed, that their efficacy in this point
of view is they are much less to be depended upon than
that of those of the mechanical class: since, by reason of
the prodigious quantity in to accession of new lights that are constantly
forming pouring in upon this branch of science,
an expedient that shall be adequate to the purpose
today, shall by some fresh discovery be rendered inadequate tomorrow.
I forbear giving details – not certainly with any views
of mystery – (for the curtain is compleatly drawn
and to every age in any degree conversant with that
science) – but merely to avoid swelling these encumbering the paper
with matter that might be spared discussions not necessary to the purpose.
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manual of political economy |
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334 |
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001 |
chemical expedients |
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jeremy bentham |
1798 <…>m |
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1798 |
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1744 |
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