Improvements in Solutions for Removing Rust Stains from Cloth.
Year: 1889

page_text: Date of Application, 11th June, 1889
Complete Specification Left, 10th Mar., 1890-Accepted, 26th. Apr., 1890
PROVISIONAL SPECIFICATION.
Improvements in Solutions for Removing Rust Stains from Cloth.
I, AUGUST BUEOHER, chem. doctor of Heidelberg, Germany, do hereby declare the
nature of this invention to be as follows:-
:-
My invention consists of a combination of chemicals for removing rust stains from
cloth and such like material.
The means used till now for this purpose have been very imperfect in their action,
as they do not remove the rust stains completely or if they do they injure the texture
of the cloth, so that the use of such means is not only dangerous but of no benefit.
Sorell salts has been one of the chief agents used for this purpose, but it does not
remove the stains completely.
: My solution, which removes the oldest rust stains from cloth of any kind without
in the least injuring the same, consists of oxalic acid, chloride of tin and a solution of
benzoic acid.
I use the following proportions of the above named chemicals and prepare them in
the manner to be described.
I take 15 grammes of oxalic acid and 20 grammes of chloride of tin and dissolve
them in 1 ltr. of distilled water I then add 50 cubic cms. of water containing %
of benzoic acid...
This solution is used as follows.
If the rust stains are old and many of them in the cloth to be treated I dip the
cloth in one liter of boiling water to which 200 grammes of the above solution have
been added and leave them in this hot liquid for 20 or 25 minutes according as is
necessary. I then remove the cloth and rinse it in cold water and let it lie in clean
cold water for about two hours when it will be found that all the rust stains have
completely disappeared.
Small stains are easily removed by dipping the part of the cloth where the stain is
in warm water containing 50% of the rust removing solution and then washing the
same in clean cold water.
If the stains are not removed by the last mentioned process it will be necessary to
boil the liquid once or twice as required.
Dated Raulin this 60th 1..
1000
R.
BLANKENHAGEN,
7, Lüneburger Strasse, Berlin, N.W., Germany, Agent for Applicant.
COMPLETE SPECIFICATION.
Improvements in Solutions for Removing Rust Stains from Cloth.
I, AUGUST BUECHER, of the Town of Heidelberg, in the German Empire, Doctor
of Philosophy, do hereby declare the nature of my said invention, and in what manner
the same is to be performed, to be particularly described and ascertained in and by
the following statement :-
My invention consists of a combination of chemicals for removing rust stains from
cloth and such like material. The means hitherto used for this purpose are very
imperfect in their action, as the same do not completely remove the rust stains, or if
the stains should be removed it will at once be noticed that the texture of the cloth
is greatly injured, so that the use of such means as hitherto employed is not only
dangerous, but no benefit is derived from same. Sorell salts has been one of the
chief ingredients employed, but this does not completely remove the stains.
My improved solution, which removes the oldest rust stains from cloth of any kind
without in the least injuring the same, consists of purified anhydride oxalic acid
I Dain T

page_text: chloride of tin and an aqueous solution of benzoic acid. I use the following pro-
portions of the above named chemicals and prepare them in the manner hereinafter
described, which I have found excellent, without, however, confining myself to the
exact proportions given, as these can be varied according to requirements without in
any way departing from the nature of my invention.
I take 15 grammes of oxalic acid anhydride and 20 grammes of chloride of tin,
dissolve them in 1 litres of distilled water and then add 50 cubic centimeters of
water containing % of benzoic acid. This solution is used as follows:-
If the rust stains are old and many of them in the cloth to be treated I dip the
cloth in one liter of boiling water to which 200 grammes of the above solution have
been added, and allow the same to remain in this hot liquid for the space of from 20
to 25 minutes according to requirements, the said liquid being kept in a continuous
state of boiling. I then remove the cloth and rinse it in cold water for about two
hours, when it will be found that all the rust stains have completely disappeared.
Small stains are easily removed by dipping the part of the cloth containing the stain
in warm water containing 50% of the rust removing solution, and then washing the
same in clean cold water. If the stains are not removed by the last mentioned process
it will be necessary to boil the liquid once or twice as required.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what I
claim is :-
A rust removing liquid consisting of a solution of oxalic acid, chloride of tin and
diluted benzoic acid, acting together substantially as specified.
Dated this 10th day of March 1890.
ALLISON BROS.,
Agents for the Applicant.