_EXPERIMENT XVII._
The emergency, _Pyrophilus_, of Colours upon the Coalition of the Particles
of such Bodies as were neither of them of the Colour of that Mixture
whereof they are the Ingredients, is very well worth our attentive
Observation, as being of good use both Speculative and Practical; For much
of the Mechanical use of Colours among Painters and Dyers, doth depend upon
the Knowledge of what Colours may be produc'd by the Mixtures of Pigments
so and so Colour'd. And (as we lately intimated) 'tis of advantage to the
contemplative Naturalist, to know how many and which Colours are Primitive
(if I may so call them) and Simple, because it both eases his Labour by
confining his most sollicitous Enquiry to a small Number of Colours upon
which the rest depend, and assists him to judge of the nature of particular
compounded Colours, by shewing him from the Mixture of what more Simple
ones, and of what Proportions of them to one another, the particular Colour
to be consider'd does result. But because to insist on the Proportions, the
Manner and the Effects of such Mixtures would oblige me to consider a
greater part of the Painters Art and Dyers Trade, than I am well acquainted
with, I confin'd my self to make Trial of _several ways to produce Green_,
by the composition of Blew and Yellow.
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