Secondly, That this Experiment, though not made with the same
_Menstruums_, nor producing the same Colour is yet much of Kin to that
other to be mentioned in this Tract among our other Experiments of Colours,
about turning a Solution of Praecipitate into an Orange-colour, and the
Chymical Reason being much alike in both, the annexing it to one of them
may suffice FOR both.
_EXPERIMENT II._
Make a strong Infusion of broken Galls in Fair Water, and having Filtred it
into a clean Vial, add more of the same liquor to it, till you have made it
somewhat Transparent, and sufficiently diluted the Colour, for the credit
of the Experiment, lest otherwise the Darkness of the liquor might make it
be objected, that 'twas already almost Ink; Into this Infusion shake a
convenient quantity of a Cleer, but very strong Solution of Vitriol, and
you shall immediately see the mixture turn Black almost like Ink, and such
a way of producing Blackness is vulgar enough; but if presently after you
doe upon this mixture drop a small quantity of good oyl of Vitriol, and, by
shaking the Vial disperse it nimbly through the two other liquors, you
shall (if you perform your part well, and have employ'd oyl of Vitriol
Cleer and Strong enough) see the Darkness of the liquor presently begin to
be discuss'd, and grow pretty Cleer and Transparent, losing its Inky
Blackness, which you may again restore to it by the affusion of a small
quantity of a very strong Solution of Salt of Tartar.
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