A NEW METHOD OF MAKING AN ACID FOR CORRODING LEAD, AND FOR OTHER PURPOSES; AND ALSO OF A NEW METHOD OF PREPARING AND MAKING WHITE LEAD, EITHER WITH OR WITHOUT THE SAID ACID
Year: 1800

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, THOMAS
GRACE, of Neat House, in the Parish of Saint George, Hanover Square, in
the County of Middlesex, White Lead Maker, send greeting.
WHEREAS His most Excellent Majesty King George the Third, by His..
Letters Patent under the Great Seal of Great Britain, bearing date at West-
minster, the Thirtieth day of December, in the forty-first year of His reign,.
did give and grant unto me, the said Thomas Grace, my executors, admi-
nistrators, and assigns, His special licence, full power, sole privilege and
authority, that I, the said Thomas Grace, during the term of years therein
mentioned, should and lawfully might make, use, exercise, and vend, within
that part of the Kingdom of Great Britain called England, the Dominion'
of Wales, and Town of Berwick-upon-Tweed, my Invention of "A NEW
METHOD OF MAKING AN ACID FOR CORRODING LEAD, AND FOR OTHER PURPOSES;
AND ALSO OF A NEW METHOD OF PREPARING AND MAKING WHITE LEAD, EITHER
WITH OR WITHOUT THE SAID ACID;" in which said Letters Patent is contained
a proviso requiring me, the said Thomas Grace, to describe and ascertain the
nature of my said Invention, and in what manner the same is to be per-
formed, by an instrument in writing under my hand and seal, and cause the
same to be inrolled in His Majesty's High Court of Chancery within one
calendar month next and immediately after the date of the said Letters

page_text: Patent, as in and by such Letters Patent will more fully and at large
appear.
NOW KNOW YE, that I, the said Thomas Grace, in pursuance of and in
compliance with the said. proviso, do hereby declare that my method of
making the acid is as follows:-
Instead of using common water, which is generally used with malt, sugar,
syrup, or molasses, or other ingredients, in the usual way of making such
kind of acid, I substitute the water which wheat or any other substance has
been steeped in for the purpose of making starch, which water the starch
makers call sour water; or I take the wash or residuum after the distillation
or rectification of spirits, which is commonly of little use, to either or both
of which I sometimes add the water upon which turpentine has been dis-
tilled, and which in distillation comes over with the oil of turpentine, and is
then separated from it, and usually thrown away; to these I add a quantity
of molasses, syrup, or sugar, in the proportion of half a pound to a gallon
of either the sour water, or distillers' or rectifiers' wash or residuum, or
mixture of both, or more or less than half a pound, according to the intended
strength of the acid, and ferment them in the usual manner, as follows:-I
fill a large vat or back, which has a false bottom full of holes, half full of
rapes or raisins, from which wine has been made, and then fill up the vat
or back with the liquor composed of or produced by the ingredients before
mentioned, and let them remain together about twenty-four hours; I then
draw half the liquor off, and return it when the rapes or raisins are sufficiently
heated, and thus I continue the operation till a proper acid is produced,
which will commonly be done in the space of fourteen days, or thereabouts.
This acid I use for corroding lead, and for other purposes; the essence of
its Invention, and the difference from the usual mode heretofore adopted for.
making such kind of acid, being in the substitution of the aforesaid sour
water or wash, or residuum, or both, in the stead of common water, with the
optional addition of the turpentine water, before described. Instead of the
usual method of corroding lead for making white lead, by spreading upon
the floor a bed, stratum, or layer of horse-litter or tanners' bark, upon
which, pots filled with acid are placed, and over which sheets of lead are
suspended or laid, for the purpose of being corroded and made into white
lead, I place rapes or raisins after they have been made use of by the wine
makers, or hops after they have been used by the brewers, and which are
usually thrown away, or grains after the brewers or starch makers have
done with them, either alone or with a small quantity of horse-litter, or
tanners' bark, or both; and this method which I have invented may be used

page_text: with the before-mentioned newly-invented acid, or with any of the acids
generally used for corroding lead.
In witness whereof, I, the said Thomas Grace, have hereunto set my
hand and seal, the Twenty-seventh day of January, in the forty-
first year of the reign of our Sovereign- Lord George the Third, by
the grace of God of the United Kingdom of Great Britain and
Ireland King, Defender of the Faith, and in the year of our Lord
One thousand eight hundred and one.
London.
AND BE IT REMEMBERED, that on the same Twenty-seventh day of
January, in the year above mentioned, the aforesaid Thomas Grace came
before our Lord the King in His Chancery, and acknowledged the Specifi-
cation aforesaid, and all and every thing therein contained, in form above
written. And also the. Specification aforesaid was stamped according to
the tenor of the Statute in that case made and provided.