| Schlippe’s salt | 60 grains |
| Water | 1 ounce |
| Caustic soda solution, 10 per cent | 6 drops |
Finally the negative is again thoroughly washed and dried. The addition of the small quantity of caustic soda is to prevent surface crystallization. It is claimed that with this intensifier the operation may be carried out to a greater {553} extent than with bichloride of mercury; that it gives clear shadows, and that it possesses the special advantage of removing entirely any yellow stain the negative may have acquired during development and fixing. Furthermore, with this intensifying method it is not necessary to wash the negative, even after fixing, as carefully as in the case of the intensifying processes with mercury, because small traces of hypo which may have been left in the film will be rendered innocuous by the free iodine. The iodine solution may be employed repeatedly if its strength is kept up by the addition of concentrated stock solution.
Uranium Intensifier.—
| Potassium ferricyanide (washed) | 48 grains |
| Uranium nitrate | 48 grains |
| Sodium acetate | 48 grains |
| Glacial acetic acid | 1 ounce |
| Distilled water to | 10 ounces. |
Label: Poison. Immerse the well-washed negative till the desired intensification is reached, rinse for 5 minutes and dry. This intensifier acts very strongly and should not therefore be allowed to act too long.
Miscellaneous Formulas:
Renovating A Camera.
| Raw linseed oil | 6 ounces |
| White wine vinegar | 3 ounces |
| Methylated spirit | 3 ounces |
| Butter of antimony | 1/2 ounce |
Mix the oil with vinegar by degrees, shaking well to prevent separation after each addition, then add the spirit and antimony, and mix thoroughly. Shake before using.