The Theory and Practice of BrewingCombrune, Michael
Science
The Theory and Practice of Brewing
Combrune, Michael
Brewing
heat, are lost to any future wort, not being soluble in water; which is
likewise true of those oils which are contained in the shoot or plume;
so that the internal part of the malt has remaining in it a greater
proportion of salts to the oils than before, consequently are less
viscid, more saccharine, and easier to be extracted.
In this process, the acid parts of the grain, though they are the most
ponderous, yet being very attractive of water, become weaker, and, by
the continued heat of the kiln, are volatilized and evaporated with the
aqueous steam of the malt. Thus, by malting, the grain acquires new
properties, and these vary at the different stages of dryness; in the
first it resembles the fruits ripened by a weaker sun, and in the last
those which are the growth of the hottest climates.
When the whiteness of the barley has not been greatly changed by the
heat it has been kept in, it is called pale malt, from its having
retained its original color; but when the fire in the kiln has been
made more vehement, or kept up a longer time, it affects both the
oils and the salts of the grain, in proportion to the degree of the
heat, and to the time it has been maintained, and thus occasions a
considerable alteration in the color. Actual blackness seldom is,
and ought never to be, suffered in malts; but in proportion to the
intenseness of the fire they have been exposed to, the nearer do they
come to that tinge, and from the different brown they shew, receive
their several denominations.
The condition the barley was gathered in, whether green or ripe, is
also clearly discernible when it is malted. If gathered green, it
rather loses than gains in quantity; for the stock of oils in unripe
corn being small, the whole is spent in germination, from whence the
malt becomes of a smaller body, appears shrivelled, and is often
unkindly, or hard. That, on the contrary, which hath come to full
maturity, increases by malting, and if properly carried through the
process, appears plump, bright, clean, and, on being cracked, readily
yields the fine mealy parts, so much desired by the brewer.
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