A NEW COMPOSITION TO BE USED AS A SUBSTITUTE FOR WHITE LEAD FOR PAINTING AND OTHER PURPOSES."
Year: 1876

page_text: LETTERS PATENT to Louis Henry, Manufacturer, of Paris, in the Republic of
France, for the Invention of "A NEW COMPOSITION TO BE USED AS A
SUBSTITUTE FOR WHITE LEAD FOR PAINTING AND OTHER PURPOSES."
PROVISIONAL SPECIFICATION left by the said Louis Henry at the Office of
the Commissioners of Patents on the 25th September 1876.
LOUIS HENRY, Manufacturer, of Paris, in the Republic of France.
"A NEW
COMPOSITION TO BE USED AS A SUBSTITUTE FOR WHITE LEAD FOR PAINTING AND
OTHER PURPOSES."
The best coating for painting has hitherto been white lead, the manufacture and
use of which are so injurious to workmen. I have sought a product, which while
rendering the same services as the said white lead does not present the disadvantages
above set forth. I have not only attained this object but gone beyond it, as my
product is superior to white lead without taking into account that it is 50 per cent.
cheaper, and that with an equal weight I may cover one-third more surface.
All cements do not completely destroy humidity or damp, they only isolate it,
and little by little the layer or coat of paint is eaten away.
My composition which I term "Paris cement white" will be found of great
service used as a cement, that is to say, applied upon the moist or damp parts as
mastic, and the paint placed over it will always preserve its freshness, will not peel
off, and there will be no blisters; this part will be as hard as stucco.
When executing rich or costly works it will only be necessary to use my cement
as mastic to obtain panels of a brilliant whiteness or marbled, as may be desired,
and with a perfect polish.
In order that the resistance of my composition may be understood I will institute
a comparison.
It is well known that when it is desired to remove paint from a signboard, for
example, the painter is obliged by means of a small apparatus to apply flame to the
part first coated in order to remove the white lead; now my composition resists
this firing, thus proving its hardness, and it also resists potassium.
My product which I will herein-after describe is manufactured like white lead

page_text: 2. Daryta.
3°. Oil.
4°. Water.
5. Zinc.
I do not here give the proportion of each product as they vary with the quality
of the said product and their destined use, whether as a mastic cement, for painting, 1
for preserving railway sleepers, for making troughs or tanks water-tight, and the
innumerable other purposes to which my composition made of the above-mentioned
matters in various proportions may be applied.
5. Zinc.
I do not here give the proportion of each product as they vary with the quality
of the said product and their destined use, whether as a mastic cement, for painting,
for preserving railway sleepers, for making troughs or tanks water-tight, and the
innumerable other purposes to which my composition made of the above-mentioned
matters in various proportions may be applied.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by the
said Louis Henry in the Great Seal Patent Office on the 22nd March 1877.
LOUIS HENRY, Manufacturer, of Paris, in the Republic of France. "A NEW
COMPOSITION TO BE USED AS A SUBSTITUTE FOR WHITE LEAD FOR PAINTING AND
OTHER PURPOSES."
The best coating for painting has hitherto been white lead, the manufacture and
use of which are so injurious to workmen. I have sought a product, which while
rendering the same services as the said white lead does not present the disadvantages
above set forth. I have not only attained this object but gone beyond it, as my
product is superior to white lead without taking into account that it is 50 per cent.
cheaper, and that with an equal weight I may cover one-third more surface.
All cements do not completely destroy humidity or damp, they only isolate it,
and little by little the layer or coat of paint is eaten away.
My composition which I term "Paris cement white" will be found of great
service used as a cement, that is to say, applied upon the moist or damp parts as
mastic, and the paint placed over it will always preserve its freshness, will not peel
off, and there will be no blisters; this part will be as hard as stucco.
When executing rich or costly works it will only be necessary to use my cement
as mastic to obtain panels of a brilliant whiteness or marbled, as may be desired,
and with a perfect polish.
In order that the resistance of my composition may be understood I will institute
acomparison.
It is well known that when it is desired to remove paint from a signboard, for
example, the painter is obliged by means of a small apparatus to apply flame to the
part first coated in order to remove the white lead; now my composition resists
this firing, thus proving its hardness, and it also resists potassium.
My product which I will hercin-after describe is manufactured like white lead
with kneading machines; it is therefore delivered in a paste and when to be used
for painting it is dissolved in linseed oil as is done with white lead.
My white is composed of the following parts:-
1°. Whiting or Spanish white.

page_text: Having now described and ascertained the nature of my said Invention, I claim
as secured to me by the herein-before in part recited Letters Patent, the com-
bination of the matters above set forth in any suitable proportions to form a
composition to be used as a substitute for white lead for painting and other
purposes, substantially as herein-before described.
In witness whereof, I, the said Louis Henry, have hereunto set, my hand
and seal, this Seventeenth day of March, in the year of our Lord One
thousand eight hundred and seventy-seven.
L. HENRY. (L.S.)
Louis Henry.