IMPROVEMENTS IN METALLIC PAINTS
Year: 1885

page_text: I FERDINAND BOSSHARDT of the firm of Bosshardt & Grant of 24 Bulls Head
Exchange Chambers, Market Place, Manchester in the County of Lancaster
Mechanical & Consulting Engineer and Patent Solicitors, do hereby declare the
nature of my invention for "IMPROVEMENTS IN METALLIC PAINTS which has
been communicated to me by Harry Graf, Merchant of Hamburg in the Empire of
Germany, to be as follows:-
"
In the process of distilling zinc there is deposited in the condenser pipes or
tubes leading from the retorts, a zinc powder or dust of exceeding fineness, which
is not white zinc, or an oxide of zinc which I name sublimated zinc, to distinguish
it from flower of zinc, white zinc or zinc in any other form.
This dust is sometimes known as "blue-zine powder or zinc-dust," and it has
never, so far as I am aware, been used in the manufacture of paint.
After being deposited in the condenser tubes connected with the retorts it is
recharged in the retorts and comes out in metallic form at the next heat.
I have discovered that paints containing this powder have a number of
advantages over other metallic paints of that character, and especially that they
have much more body than any other, and much greater preservative qualities,
against the action or influence of either salt-air or salt-water and are much more
economical on account of requiring but one coat whereas of other paints, two are
always necessary.
In making the paint, I vary the proportion of the zinc powder or dust to the
remainder of the ingredients, according to the use for which it is intended, and
I may use it in paints as a substitute for white lead or white zinc, or zinc in any
other form as now used or it may be used in combination with either of these
pigments or bases.
To make a drab paint for vessels I use four parts of whiting, eight parts of this
zine powder or dust and four parts of white lead.
The whiting, powder, and lead, are intimately mixed and ground together and
incorporated with suitable oil, and turpentine and dried in the ordinary way.

page_text: A fine olive green is made by using four parts of whiting eight parts of the zine
powder or dust and four parts of red ochre. These are intimately mixed by
grinding and incorporated with a proper vehicle and drier in the ordinary way.
A brown colour, suitable for iron work, is produced by using eight parts of
whiting, four parts of zinc powder or dust and four parts each of red ochre and
black ochre. The process of making this paint is like that of the others.
It will also be observed that the above mentioned solid ingredients of the paints,
such as white lead, whiting red ochre and black ochre, are all substances which
unite similarly with the vehicle, and are as paint bodies the substantial equivalents
of each other, except as they affect the colour of the paint, and they may be used
indifferently as auxiliary bodies to the zinc sublimate, the choice of the workman,
among these or other known constituents of the paint, being governed by the
colour desired. These proportions may be varied for different kinds of work and
to obtain different shades.
I do not confine myself to the proportions herein indicated; neither do I confine
myself to the proportions of zinc powder or dust used in making the paint, but
would state that as a general rule from one sixth to two-thirds of the base of the
paint may be of this zinc powder or dust.

page_text: Improvements in Metallic Paints.
I, FERDINAND BOSSHARDT, of the firm of Bosshardt & Grant, Mechanical
& Consulting Engineers & Patent Agents, of 24 & 32 Bulls Head, Exchange
Chambers Market Place, Manchester in the County of Lancaster, do hereby
declare the nature of this invention which has been communicated to me from
abroad by Harry Graf of Hamburg in the Empire of Germany, Merchant, and
in what manner the same is to be performed to be particularly described &
ascertained in and by the following statement:-
In the process of distilling zinc, there is deposited in the condenser pipes or
tubes leading from the retorts, a zinc powder or dust of exceeding fineness, which
is not white zine, nor an oxide of zinc which I name sublimated zinc to distinguish
it from flower of zinc, white zine or zinc in any other form.
This dust is sometimes known as blue zinc powder or zinc dust, and it has
never, so far as I am aware been used in the manufacture of paint.
After being deposited in the condenser tubes connected with the retorts, it is
recharged in the retorts and comes out in metallic form at the next heat.
I have discovered that paints containing this powder have a number of
advantages over other metallic paints of that character and especially that they
have much more body than any other, and much greater preservative qualities,
against the action or influence of either salt air or salt water and are much more
economical on account of requiring but one coat, whereas of other paints two are
always necessary.
In making the paint I vary tho proportion of the zine powder or dust to the
remainder of the ingredients according to the use for which it is intended, and
I may use it in paints as a substitute for white lead or white zine, or zinc in any
other form as now used, or it may be used in combination with either of these
pigments or bases.
To make a drab paint for vessels I use four parts of whiting, eight parts of this
zinc powder or dust and four parts of white lead.
The whiting, powder, and lead, are intimately mixed and ground together and
incorporated with suitable oil and turpentine, and dried in the ordinary way.
A fine olive green is made by using four parts of whiting, eight parts of the zinc
powder or dust and four parts of red ochre.
These are intimately mixed by grinding and incorporated with a proper vehicle
and dried in the ordinary way.
A brown colour suitable for iron-work is produced by using eight parts of
whiting, four parts of zinc powder or dust, and four parts each of red ochre and
black ochre. The process of making this paint is like that of the others.
It will also be observed that the above mentioned solid ingredients of the
paints, such as white lead, whiting red ochre & black ochre, are all substances
which unite similarly with the vehicle, and are, as paint bodies, the substantial
equivalents of each other, except as they affect the colour of the paint, and they
may be used indifferently as auxiliary bodies to the zinc sublimate, the choice of

page_text: the workman, among these or other known constituents of the paint, being
governed by the colour desirable. These proportions may be varied for different
kinds of work, and to obtain different shades."
I do not confine myself to the proportions herein indicated, neither do I confine
myself to the proportions of. zinc powder or dust used in making the paint, but
would state, that as a general rule from one-sixth to two-thirds of the base of the
paint may be of this zinc powder or dust.
Having now 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 metallic paint compound of sublimated zinc powder of the nature as herein-
before described, mixed or compounded with whiting or other suitable colouring or
filling matter as set forth.