But it may be asked, "How does that
highest and best method of classifying the dyestuffs affect the users,
the dyers, in their processes?" In reply, I would say, "I believe that
the dyer who so understands the chemical principles involved in the
processes he carries out, and in the best methods of classifying the
dyes as chemical substances, so as to be able to act independently of
the prescriptions and recipes given him by the dye manufacturers, and so
be master of his own position, will, _ceteris paribus_, be the most
economical and successful dyer." Many manufacturers of dyestuffs have
said the very same thing to me, but, independently of this, I know it,
and can prove it with the greatest ease. Let me now, by means of an
experiment or two, prove to you that at least some classification is
necessary to begin with. So different and varied are the substances used
as colouring matters by the dyer, both as regards their chemical and
physical properties, that they even act differently towards the same
fibre. I will take four pieces of cotton fabric; three of them are
simple white cotton, whilst the fourth cotton piece has had certain
metallic salts mixed with thickening substances like gum, printed on it
in the form of a pattern, which at present cannot readily be discerned.
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