| Beeswax | 1⁄2 | ounce. |
| Resin | 1 | ounce. |
| Shoemaker’s Wax | 1 | ounce. |
| Litho-printing Ink, black | 2 | ounces. |
Melt together. When cool, mix with turpentine to the consistency of soft soap.
The roller is charged with this ink, and the plate warmed and rolled up, so as to close up the high lights and half tones, leaving only the deepest portions bare. Immerse in the etching fluid again for about three minutes, rocking during the immersion, and finally wash the plate.
Next remove the resist of bitumen, by means of turpentine, and take proofs in the press. If deeper etching is required, proceed as before.
The following is equally satisfactory, and a little quicker:
| Fuming Muriatic Acid (sp. gr. 1.190) | 10 | parts. | |
| Water | 70 | parts. | |
To this is added a boiling solution of | |||
| Chlorate of Potash | 2 | parts. | |
| Water | 20 | parts. | |
This is diluted for use by adding 1 part to from 100 to 400 parts of water.
The time of immersion in either of these mordants is ruled by the temperature of the room and of the liquids used. One or two careful trials will soon give the desired information.
CHAPTER II. HALF-TONE INTAGLIOS.
We now come to quite a different class of work, namely, the production of half-tone intaglio plates. They may be produced in many ways, each way giving results quite unlike the others.