DE112338C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

The present invention relates to a method which makes it possible to generate images that change with temperature change, and indeed in such a way that not only their color, but also their color also the drawing, that is, the form of the picture itself, changes by adding individual, previously colorless ones or only weakly colored, covered by the strongly colored parts of the picture and at the same time parts pushed into the background. color strongly when the temperature changes, so emerge, while the previously strongly colored parts of the picture from the heating fade or disappear entirely.

Such images can be applied to all kinds of objects, e.g. B. on paper, metal, porcelain and the like.

The process in which special chemical colors that have the property must behave differently at different temperatures, be used, consists essentially in the fact that it is on the surface of the object in question on one and the same spot on top of each other two different pictures of different ones Coloring can be applied, either the lower picture with just in the cold, d. H. at normal temperature, visible colors, but disappearing when heated, the upper one, on the other hand, appears only when it is heated, at an ordinary temperature but invisible colors is made, or vice versa.

Colors, which have the appropriate properties, are in the form of various chemical Compounds known and in part already commercially using them Properties used for similar purposes, e.g. the magnesium-platinum-cyanur, which is red at ordinary temperature, disappears when heated, below when cooled Gradual absorption of moisture from the air, but almost when breathing on at the same time suddenly turns red again. As colors that are invisible at ordinary temperature, warmed up but are visible, the solutions of some cobalt salts, as well as some other compounds, serve above all else. very known and suitable are:

for blue: cobalt chloride,

for yellow: copper chloride,

for green: a mixture of both in equal parts,

for brown: copper sulphate with potassium bromide, in equal parts in 20 times the amount of water solved.

It is, however, not easy to find the different colors on the same part of the picture to apply over one another, since they partly influence each other and thereby for would be unusable for the present purpose. To now put the different layers of paint on the same To be able to bring places on top of each other without their properties changing, proceed in the following way:

Either you have to choose colors for the two different pictures, which only are soluble in various agents, the lower z. B. in water, the upper one in oil or alcohol, or, if one uses colors that are soluble in the same medium for both pictures, so must after application of the first resp. lower picture about the same one against both colors

and the solvent-indifferent layer, which is transparent, so that it is the underneath the image is shining through, as a coating are applied, on which the second respectively. upper picture is applied, be it by applying or printing the. Color in solution, be it by dusting it up in the form of a dry powder, for the latter purpose the indifferent layer Must be sticky enough to hold the paint powder in place. As a suitable material for the Shellac or photographic negative lacquer can serve as the intermediate layer.

The procedure is explained in more detail below using an example:

Assuming it is a piece of flowers, a rose and some forget-me-nots, of which the latter a part is in the same place as on which also the rose is attached. In this case, the poison-me-nots will flower first then smeared with an aqueous solution of cobalt chloride by means of a fine brush After drying, apply a shellac or negative lacquer solution on the whole λ'οη of the rose area to be covered and only after this layer has dried completely the rose colored red with an aqueous solution of magnesium-platinum-cyanur. Latter Solution must be concentrated; if she were too thin, only the Color the edge of the rose and it would be necessary to coat the remaining parts of the rose with the solution again. The poison-me-nots appear almost not colored at ordinary temperature, pale gray at most, but turn nice blue when heated, while the red the rose, which previously covered the poison-me-not flowers below, disappears and at most a very fine yellowish tone remains, on which the forget-me-nots beautifully colored are visible.

Instead of as described above, one can also proceed in such a way that after the dyeing the cobalt solution used for poison-me-not flowers is dried, the firnifs are applied and on these, after drying, the finely powdered magnesium-platinum-cyanur averages a fine cotton tampon is powdered.

Finally, the production can also take place in such a way that the forget-me-nots are involved Cobalt chloride in a rubber solution and, after drying, the rose with magnesium-platinum-cyanur be made in firnif solution.

Claims (3)

Patent Claims: 1. A method for generating changing images when there is a change in temperature, characterized in that that on one and the same spot on the surface to be covered with the pictures, two different drawings on top of each other be attached, one of which is colored with such colors, which only are visible at ordinary temperature, but disappear when heated but others with such colors are, conversely, only visible in warmth, but disappear at ordinary temperature taking care that the different colors not affect or destroy one another. 2. An embodiment of the in claim ι characterized method, characterized in that colors are used for one image, which are in solve a different means than the colors of the other picture, so that the two drawings and pictures run into one another to prevent when applying. 3. Instead of the method characterized in claim 1, an embodiment of the same, colors which are soluble in the same agent can be used for both images, characterized in that an indifferent but transparent separating layer was applied between the lower and the upper image will.