Formula for Acid Baths.
(H. R. Blaney.)
| No. 1 | should | register | to | Beaumé's | scale | 42 deg. |
| No. 2 | " | " | " | " | " | 37 deg. |
| No. 3 | " | " | " | " | " | 33 deg. |
| No. 4 | " | " | " | " | " | 30 deg. |
The temperature of the bath to be at 63 deg. Fahr. when tested.
(Denison's.)
No. 1 should be made to register Beaumé's scale, 45 deg., the percentage of perchloride in this solution is 47, and the specific gravity 1.444.
| No. 2, 40 | deg.; | percentage, | 41; | spec. grav. | 1.375 |
| No. 3, 38 | " | " | 38; | " | 1.339 |
| No. 4, 35 | " | " | 35; | " | 1.313 |
| No. 5, 27 | " | " | 27; | " | 1.225 |
From an article in the Photographic News (English), Nov. 1, 1889, as practiced in India.