The Manufacture of Objects in such a Manner that they Change their Colour when Subjected to Certain Influences.
Year: 1887

page_text: Date of Application, 7th May, 1887.
Specification Accepted, 5th July, 1887.
The Manufacture of Objects in such a Manner that they Change
their Colour when Subjected to Certain Influences.
We MAX HIMLY of Vienna III Apostelg 12 Engineer, FERDINAND LEISER of
Vienna IV Margarethenstrasse 25 Engineer and JOHANNES BARDTHOLDT of Vienna IV
Margarethenstrasse 26 Merchant in the Empire of Austria 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:-
The aim of this invention is the production or preparation of objects of all kinds
in such a manner that they change their colour when subjected to certain influences.
Our attention is especially directed to a change from white to red, and vice-versa, and
moreover this property when imparted to the objects must be lasting. The objects to
be prepared may also be of some other colour besides white, and, in this case, the colour
produced will of course be a combination of red with the ground-colour.
We employ for this purpose Platina Magnesium Cyanide. This salt is dissolved,
and the solution in combination with some medium such as Gelatine, Shell-lack, Gum
&c. is applied to the object that is to be prepared, or the latter is impregnated with it.
Objects prepared in this manner will, when dry, possess their original colour, until
they have been breathed, or.blown upon or indeed exposed to damp air when they, if
white, assume a fine pink or red colour, or, if originally otherwise coloured than white
they take a shade partaking of the ground-colour, and red. The objects will retain
this colour until such time as they are warmed, when the red tint completely
disappears and the object recovers its original colour. This change can be repeated, at
pleasure without the objects so prepared losing the property of changing their colour.
This process may be utilized in many ways for industrial purposes. For instance,
artificial or natural flowers can be so prepared that they will change their original
colour, to a fine red or some cognate tint when breathed or blown upon. Or pictures
cards &c. can be so prepared that the whole or parts of them will only appear when
breathed or blown upon and then disappear when warmed. In the same way the
aforesaid solution can be employed like the so-called sympathetic ink.

page_text: 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:
1. As a new industrial product objects which are entirely or partially painted,
drawn, printed, covered, or impregnated with a solution of Platina, Magnesium,
Cyanide mixed with some medium for the purpose, and substantially as herein
described.
2. A process for preparing objects so as to make them capable of changing their
colour, and consisting in making a solution of Platina, Magnesium, Cyanide,
combining the same with a medium, and then applying it to the objects to be prepared,
for the purpose and substantially as herein described.
1444 BED
P. O'HALLORAN,
Gray's Inn Chambers, 20, High Holborn, W.C.,
Agent for the Applicants.