ETCHING GLASS."
Year: 1881

page_text: PROVISIONAL SPECIFICATION left by the said Julius Fahdt at the Office
of the Commissioners of Patents on the 27th August 1881.
JULIUS FAHDT, of Dresden, Saxony, German Empire.
ETCHING GLASS."
"IMPROVEMENTS IN
This Invention relates to improvements in etching glass, that is, in the method
of providing and embellishing the glass with any designs of a deadened non-
transparent surface.
The sole method hitherto known of etching glass chemically consisted in the use
of fluoric acid, which being corrosive is well known to be very fatal to the health
of the operator.
The said Invention consists in providing a chemical corrosive, and in applying
it to form designs on or to etch the glass in such a manner as to perfectly obviate
the danger inseparably connected with the use of fluoric acid.
Instead of the fluoric acid, hitherto exclusively employed for the chemical etching
of glass, I use only fluorides or fluates in a dry state which never develop the
dangerous vapours of the acid.
The said fluates are brought upon the glass to be etched by means of a suitable
gluten such as arabic troches-broches gum of any kind, gum-lac and other lacs of vege-
table resins, dextrine, starch, glycerine, varnish, oil-varnish, and any other glutens of
similar kind. The said gluten is preferably brought first upon the glass by suitable
means in the exact design to be etched, and the fluate then powdered upon the
gluten in a finely pulverized state. But the powder of fluate may if desired be
mixed with the gluten previous to its being applied to the glass, the paste then
being used as a colour.
The fluates thus applied to the glass in combination with the gluten will by
their hygrosopic property attract the moisture of the atmosphere and thereby
receive the corrosive quality which enables them to etch the glass as required.
With this process any printing and stamping operation, types, rubber stamps, etc.,
may be employed for fixing upon the glass any convenient figures, letters, and
designs to be etched, or such designs may be drawn by hand or through a templet.
By these means my Invention allows of a vast variety of ornaments and embellish-
ments being etched in an easy manner upon glass of any kind.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Julius Fahdt in the Great Seal Patent Office on the 24th February
1882.
JULIUS FAHDT, of Dresden, Saxony, German Empire. "IMPROVEMENTS IN
ETCHING GLASS."
My Invention relates to improvements in etching glass, that is, in the method of
providing and embellishing the glass with any designs of a deadened non-
translucent surface. The sole process heretofore known and used of chemically
etching glass consisted in the use of fluoric-acid, which, though corrosive, is well
known to be very fatal to the health of the operator. The object of my Invention
therefore is to provide a chemical corrosive which may easily be applied and which
perfectly obviates the danger inseparably connected with the use of fluoric-acid.
Instead of the fluoric acid hitherto exclusively employed for the chemical
etching of glass, I use only the fluorides (fluates) in a dry state, which never
develope the dangerous vapours of the acid.
To carry my Invention into effect the said fluates are brought upon the glass to
be etched by means of a suitable gluten, such as arabic troches, gum of any kind,
gum-lac, and other lacs of vegetable resins, dextrine, starch, glycerine, varnish, oil-
varnish, and any other glutens of similar kind. The said gluten is preferably
transferred first to the glass by suitable means in the exact design to be etched,
and the fluate then powdered upon the gluten in a finely pulverized state.
the powder of fluate may as well be mixed with the gluten previous to its being
applied to the glass, the paste thus obtained being used as a colour.
But
The fluates thus applied to the glass in combination with the gluten will by
their hygroscopic property attract the humidity of the atmosphere, and thereby
receive the corrosive quality which enables them to etch the glass as required.
With this process any printing and stamping operation, types, rubber-stamps, etc.,
may be employed for tixing upon_the_glass_any_convenient-figures, letters,-and-
designs to be etched, or such designs may as well be drawn by hand or through
a templet. By these means my Invention allows of a vast variety of ornaments
and embellishments being etched in an easy manner upon glass of any kind.
Having thus fully described my Invention and how it may be carried into prac-
tice, what I claim is,-
The process of etching glass and similar substances of any kind, enamel, porcelain,
and the like by the use of fluorides (fluates) a dry state in combination with a
suitable gluten, substantially as described.
In witness whereof, I, the said Julius Fahdt, have hereunto set my hand
and seal, this Twenty sixth day of September, in the year of our Lord
One thousand eight hundred and eighty-one.
JULIUS FAHDT. (L.S.)