IMPROVEMENTS IN DYEING AND PRINTING AND IN THE PREPARATION OF COLORS AND STAINS FOR THESE AND OTHER PURPOSES
Year: 1882

page_text: LETTERS PATENT to Walter Wood Richardson of Nether Mills, East Street,
Leeds, Chemical Manufacturer for an Invention of "IMPROVEMENTS IN
DYEING AND PRINTING AND IN THE PREPARATION OF COLORS AND STAINS
FOR THESE AND OTHER PURPOSES."
PROVISIONAL SPECIFICATION left by the said Walter Wood Richardson at
the Office of the Commissioners of Patents on the 31st January 1882.
WALTER WOOD RICHARDSON of Nother Mills, East Street, Leeds, Chemical
Manufacturer " IMPROVEMENTS IN DYEING AND PRINTING AND IN THE PRE-
PARATION OF COLORS AND STAINS FOR THESE AND OTHER PURPOSES."
My improvements in dyeing and printing and in the preparation of colors and
stains for these and other purposes consist mainly in the use of a decoction of
logwood combined with the compound sodic or potassic metallic oxalates. I can
thereby produce blues and blacks upon wool, silk, jute, cotton and other fibres.
The color thus prepared also forms a stain suitable for paper staining and like
uses.
The compound oxalates which I employ are especially those of chromium,
copper and iron but other soluble compound metallic oxalates may be similarly
used in combination with logwood extract.
It is advantageous to add a small quantity of acid.
I can also in some cases employ a decoction of logwood together with the simple
metallic oxalates, especially in printing but in all cases the use in combination of
the extract of logwood and the compound sodic or potassic oxalates is to be
preferred.
The shades of color may be varied by the addition of other dye materials now
known and in use.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Walter Wood Richardson in the Great Seal Patent Office on the
29th July 1882.
WALTER WOOD RICHARDSON of Nether Mills, East Street, Leeds, Chemical
Manufacturer. " IMPROVEMENTS IN DYEING AND PRINTING AND IN THE PRE-
PARATION OF COLORS AND STAINS FOR THESE AND OTHER PURPOSES "
My improvements in dyeing and printing and in the preparation of colors and
stains for these and other purposes consist mainly in the use of a decoction of
logwood combined with the compound sodic or potassic metallic oxalates. I can
thereby produce blues and blacks upon wool, silk, jute, cotton and other fibres.
The color thus prepared also forms a stain suitable for paper staining and like
uses.
The compound oxalates which I employ are especially those of chromium,
copper and iron but other soluble compound metallic oxalates may be similarly
used in combination with logwood extract.
It is advantageous to add a small quantity of acid.
I can also in some cases employ a decoction of logwood together with the simple
metallic oxalates, especially in printing but in all cases the use in combination of
the extract of logwood-and-the-compound sodic or potassic oxalates is to be
preferred.
The shades of color may be varied by the addition of other dyo materials now
known and in use.
In dyeing blacks with this process I make up a decoction of logwood in the dye
pan about, or 1 lb. of logwood for each 1 lb. of goods to be dyed. I then add
1/2 oz. of sodic ferric oxalate to each 1lb. of wood in the pan and a little acid
(sulphuric or hydrochloric will do) until the dye liquor turns of a reddish brown
colour. I then enter the goods and boil until the required shade is obtained.
Should a sadder black than the above be required a little fustic or other yellow
colouring matter may be added to the bath.
Sometimes I first mordant the goods by boiling in a bath containing sodic ferric
oxalate; about, oz. to each 1 lb. of goods. I then wash them, and afterwards
dye them up with logwood or with logwood and other coloring matters recording
to the color or shade required.
With cottons or cotton warp goods I first burl dye them and then mordant them
with the sodic ferric oxalate and afterwards fill them up with logwood with or
without other colouring matters to the shade required.
For printing woollens I make up a strong decoction of logwood about 9° Twaddle
and add to this about 2 oz. of sodic ferric oxalate to every 1 lb. of extract. The
compound is then thickened with a suitable thickener, printed on the goods and
afterwards steamed, sometimes it is advisable to add a little acid to the above.
For printing or staining cottons I mix with the sodic ferric oxalate about 1/, its
weight of sodic cupric oxalate. Although in the above I only mention the sodic
ferric and cupric oxalates I can use other metallic oxalates or metallic oxalates
combined with alkalics.
Having thus described the nature of my said Invention and the manner of
performing the same I would have it understood that I claim :-
First. My improvements in dyeing and printing consisting in the use of a

page_text: decoction of logwood with a simple or compound metallic oxalate substantially as
described.
"
Second. My improvements in the preparation of colors and stains consisting in
combining a decoction of logwood with a simple or compound metallic oxalate
substantially as described.
In witness whereof I the said Walter Wood Richardson have hereunto set
my hand and seal this Twenty-sixth day of July in the year of our Lord
One thousand eight hundred and eighty two.
WALTER WOOD RICHARDSON. (L.S.)