Hectograph — it’s just a copying device to get from one of several dozen of the original single- or multicolored prints. With it, you can multiply the school texts, pictures, posters, posters, drawings, pictures, educational cards, notes, etc.
Hectograph is a rectangular tray, that correspond to the desired pattern. She filled in a special gelatinous mass. On her special ink transferred image.
On one side of the drawing paper hectograph ink (we give the recipe below) spelled the desired text or image is executed. Not allowing the ink to dry, the original text or drawing down on the frozen place an even layer hectograph mixture and lightly pressed with a rubber roller to the sheet accidentally moved. Then, carefully remove the paper by lifting one corner. On the surface, the mass will print the original. If you now press the surface of the mass of blank paper, get a copy of the original. These operations, as you can see, very simple. Please be assured that by purchasing a certain skill required in each case, and having a good paper, each of you will be able to receive up to 30 copies from one original.
Of course, first of all you need to cook a lot hectograph.
Formulation 1 100 g of glycerol to be dissolved 10 g of gelatin, previously soaked for 5 h in 20 ml of water. To rapidly dissolving gelatin in glycerol, better warm dishes in a water bath. The resulting solution pour into a metal tray low altitude. The layer thickness should not exceed 4 mm.
Recipe 2. 200 g of wood glue to hold the tiles in water overnight. During this time, the adhesive should be strong swell, but so as not to break up into pieces or blurred. It is believed that during the swelling of the adhesive absorbs water about 5 times its own volume. If after 24 hours more in the vessel remain some water must be drained it and add 600 g of glycerol. The resulting mixture was stir and put in a water bath. Evaporation of the excess water with constant stirring to last as long as the weight of the mixture of 1,000 in 1050 … The resulting mixture is slowly pour into a flat metal pan.
Often, a frozen mass gets rough surface covered with a variety of air bubbles. Align it can be so. Pour on the surface a little cologne or alcohol and ignite. The flame melts the top layer of the masses, and its surface after cooling will be very smooth.
And now a few words about hectograph ink. They are concentrated aqueous solutions of aniline dyes for fabrics. Here are some recipes hectograph ink: a) Blue — 8 ml of water, 1 g of glycerol, 1 g of aniline or methyl blue.
b) Red — 7 ml of water, 7 g of glycerol, 1 g of magenta.
a) Black — 9 ml of water, 2 g of glycerol, 1.6 g of Nigrosine.
Finally. After receiving a series of identical copies hectograph mass can be reused. To do this, wash the surface with a soft mass of black swab moistened with a solution of 95 ml of water, 4 ml of glycerol, 1 ml of alcohol or denatured alcohol.
Wipe the surface should be very careful, because it can be easily damaged. At the end of this operation, the surface of the pour 1 — 2 ml of alcohol and ignite. Frozen after regeneration smooth surface again suitable for replication copies. Recover weight so more than 15 times is not necessary. It is better to re-melt it and pour into the mold.