Improved Antifouling Composition.
Year: 1897

page_text: I, JOHN STEWART MACARTHUR, of the Firm of Blacklock & MacArthur, Paint,
Colour, and Varnish Manufacturers, West Street, Tradeston, in the city of Glasgow, do
hereby declare the nature of this invention to be as follows:-
This invention has for its object to provide an inexpensive antifouling paint or
composition which shall effectually prevent the attachment of barnacles, grass
and the like to ships' bottoms, and which may also lessen the skin friction of
vessels while sailing.
The improved antifouling paint or composition is made up of paraffin or petroleum
wax and zinc oxide ground to form a stiff paste in paraffin oil and to which is
added a small proportion of arsenious oxide (As, O3) and some mineral colouring
matter.
By preference 2 parts by weight of paraffin or petroleum wax are mixed with
1 part by weight of pure zinc oxide and to this are added about 2 per cent. of
arsenious oxide and 5 to 10 per cent. of mineral colouring matter according to the
shade of colour desired.
Instead of arsenious oxide, other arsenical, mercurial, copper or tin salts may
be used, but arsenious oxide is preferred. The wax is melted and the other
ingredients added and the whole stirred well until thoroughly mixed while hot.
1008
Improved Antifouling Composition.
I, JOIN STEWART MACARTHUR, of the Firm of Blacklock & MacArthur, Paint,
Colour, and Varnish Manufacturers, West Street, Tradeston, in the city of Glasgow, do
hereby declare the nature of this invention and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:-
This invention has for its object to provide an inexpensive antifouling paint or
composition which shall effectually prevent the attachment of barnacles, grass
and the like to ships' bottoms, and which may also lessen the skin friction of
vessels while sailing.

page_text: The improved antifouling paint or composition is made up of paraffin or petroleum
wax and zinc oxide to which is added a small proportion of arsenious oxide (As, O,)
and some mineral colouring matter.
ว
By preference 2 parts by weight of paraffin or petroleum wax are mixed with
1 part by weight of pure zinc oxide and, to this are added about
arsenious oxide and 5 to 10 per cent. of mineral colouring matter according to the
shade of colour desired.
per cent. of
Instead of arsenious oxide, other arsenical, mercurial, copper or tin salts may
be used, but arsenious oxide is preferred. The zinc oxide is ground in oil with
the mineral colouring and arsenious oxide (As, O₂) or other mineral poisons as
specified.
The wax is melted and the above ground paste added in the proportions specified.
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:
An improved antifouling composition made up of paraffin or petroleum wax to
which is added a paste composed of zinc oxide ground in oil with arsenious oxide
or equivalent poisonous metallic salt and mineral colouring matter all in or about
the proportions specified.
Dated this 4th day of August 1898.
WALLACE FAIRWEATHER,
Of the Firm of Cruikshank & Fairweather,
Chartered Patent Agents,
62, Saint Vincent Street, Glasgow, Agent for the Applicant.