1225. "Pinatype" is a process patented by Meister Lucius & Bruning, Hoechst on Main, Germany. The process is based upon the fact that bichromated gelatin exposed to the light, under a positive in a printing-frame, becomes hardened more or less according to the various degrees of transparency contained in the plate under which it is exposed. When the exposed plate has been soaked in water, the gelatin which has received the least light action becomes softened and will absorb liquid dye. This dyed plate is brought into contact with a piece of gelatin-coated paper under water, and after squeegeeing together they are put under a weight.

1226. In a short time it will be seen, on examination, that the gelatin of the paper is taking up the dye from the plate, and that a picture is being formed. The depth of the print depends upon the length of time the paper is in contact with the print plate.

1227. Three-Color

Three-Color. For color work, a suitable series of dyes are supplied, and the print is made as follows: From a good, plucky three-color set of negatives make a set of glass positives, strong in contrast, and moderately dense. These should at once be marked with the name of the color in which each has to be printed. A plain gelatin-coated plate is now sensitized either with the "Pinatype" salts, or the following quick drying bath:

The bichromate is dissolved in the water, and when cold the acetone is added to it gradually and with constant shaking of the mixture. This solution will keep well and may be used repeatedly, but when a deposit forms it should be filtered. The print plate is immersed into this solution for three minutes in artificial light, and then stood up to drain and dry. They may be put into a rack to drain, but should be spread along a shelf to dry in the dark.

1229. They are ready for use as soon as dry. Mark these plates, red, yellow. and blue, respectively with pencil. Place these in the printing-frames, face to face, down on the respective positives, back up with a black pad, and print by daylight. The exposure required will be as long as a negative of similar character to the transparencies will take a print on gelatino-chloride printing-out paper, or gelatin paper may be bichromatized and used for the purpose.

1230. When exposed, the print plates must be at once soaked in cold water until every trace of yellow has washed out. They may then be put aside to dry if desired, or printing may at once be proceeded with. Daylight is not essential for printing.