Improved Process or Means for Marking Soap Cakes or Bars with an Indelible Colour.
Year: 1892

page_text: This Print is in accordance with the Original Specification as- it stands after
Amendment (under Section 18 of the Patents, &c., Act, 1883), as allowed by
the decision of the Chief Examiner of the 17th day of October 1896.
Date of Application, 14th July, 1892-Accepted, 20th Aug., 1892
COMPLETE SPECIFICATION (AMENDED).
Improved Process or Means for Marking Soap Cakes or Bars with
an Indelible Colour.
We, GEORGE DUNCAN MACDOUGALD, of 3 Youngsdale Place, Analytical
Chemist, and JAMES STURROCK, of Seacraig, Cashier Dundee Advertiser Office,
both of Newport in the County of Fife, N.B. 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 object, the marking of cakes or bars of opaque or trans-
parent soap with a compound or ingredient of a different tint or colour to the soap,.
sucked or forced into prickings preferably produced by needles or wires, so that
the colour shall be of a permanent character, and be visible while the cake or bar
is in use.
The markings thus produced and capable of identification while the cake or bar
lasts are intended to represent given initial letters or names of firms, advertisements,
representations of trade marks, and other devices or indications, either from the
needle punctures alone or by a combination of needle punctures and surface
stamping simultaneously effected.
We put our invention into practice as follows we place a cake of soap under or
above a set of needles arranged in a frame or clamp to represent given letters or a
device, and by pressure the needles are caused to pierce the cake to a given depth,.
but not so as to pass completely through it and the places where the needles enter
the soap are sealed so as to prevent the air from entering when the needles are
withdrawn by being covered with some coloured fluid the withdrawal of the needles
create a vacuum and the colour becomes forced into the punctures, it will therefore
be understood that on the withdrawal of the needles a vacuum is formed in the
piercings and the colour which has served the purpose of a liquid seal to maintain
vacuum in the piercings becomes forced into the punctures.
We do not limit ourselves to any particular ingredients or material from which
to form our permanent colour markings in cake or bar soap; but if coloured brick
reduced to flour (powder) be mixed with water to the desired consistency it will
when in the soap of, say, a white or other light kind show a series of coloured dots
or of say finely powdered chalk be mixed with water it will when in a transparent
or dark coloured soap show a series of white dots and represent the letter or other
devices of the arrangement of needles or by arranging the needles to pass, say,
half through from each side, the same reading would appear on both sides, and
remain visible while the soap is in use and until the last of the available cake can
be seen.

page_text: Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed we declare that what we
claim is:--
The treatment of soap cakes or bars by partially puncturing them with needles
or points, and sealing the places where the needles enter, by means of a coloured
fluid as and for the purposes described.
y
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said George Duncan Macdougald and James Sturrock.