Impression of two different blues with the block.
First blue, No. 4. with starch.
Second blue, No. 9. with gum.
Impression of three blues with the block.
First blue, No. 5. with starch.
Second blue, No. 7. with starch.
Third blue, No. 10. with gum.
After printing-on the blues, the pieces are hung up for two days in a dry and airy place, but not too dry; then they are dipped as follows:—Three vats are mounted, which may be distinguished by the numbers, 1., 2., 3.—
No. 1. 300 pounds of lime to 1,800 gallons of water.
No. 2. Solution of sulphate of iron of spec. grav. 1·048.
No. 3. Solution of caustic soda of spec. grav. 1·055; made from soda crystals, quicklime, and water, as usual.
The pieces being suspended on the frames, are to be dipped in the first vat, and left in it ten minutes; then withdrawn, drained for five minutes; next plunged into the second vat for ten minutes, and drained also for five, &c. These operations will be most intelligible when put into the form of a table:—
| Dip in the 1st vat. | During 10 minutes. | Drain during 5 minutes. |
|---|---|---|
| 2 | — | — |
| 1 | — | — |
| 2 | — | — |
| 3 | — | — |
| 2 | — | — |
| 1 | — | — |
| 2 | — | — |
| 1 | — | — |
| 2 | — | — |
| 3 | — | — |