It is sometimes desired to make a copying paper which will produce at the same time a positive copy, which is not required to be reproduced, and a negative or reversed copy from which a number of direct copies can be taken. Such paper is covered on one side with a manifolding composition, and on the other with a simple copying composition, and is used between 2 sheets of paper with the manifolding side undermost.
The manifolding composition is made by mixing 5 ounces of printers’ ink with 40 of spirits of turpentine, and then mixing it with a fused mixture of 40 ounces of tallow and 5 ounces of stearine. When the mass is homogeneous, 30 ounces of the finest powdered protoxide of iron, first mixed with 15 ounces of pyrogallic {504} acid and 5 ounces of gallic acid, are stirred in till a perfect mixture is obtained. This mass will give at least 50 copies on damp paper in the ordinary way. The copying composition for the other side of the prepared paper consists of the following ingredients:
| Printers’ ink | 5 parts |
| Spirits of turpentine | 40 parts |
| Fused tallow | 30 parts |
| Fused wax | 3 parts |
| Fused rosin | 2 parts |
| Soot | 20 parts |
It goes without saying that rollers or stones or other hard materials may be used for the purpose under consideration as well as paper. The manifolding mass may be made blue with indigotin, red with magenta, or violet with methyl violet, adding 30 ounces of the chosen dye to the above quantities of pigment. If, however, they are used, the oxide of iron and gallic acids must be replaced by 20 ounces of carbonate of magnesia.
Celloidin Paper.
Cloth Paper.
Drawing Paper.
| Gum arabic | 2 parts |
| Ammonia iron citrate | 3 parts |
| Tartaric acid | 2 parts |
| Distilled water | 20 parts |
After still adding 4 parts of solution of ammonia with a solution of
| Potassium ferricyanide | 2.5 parts |
| Distilled water | 10.0 parts |