Spots On Photographic Plates.
To Remove Pyro Stains From The Fingers.
To Remove Pyro Stain From Negatives.
| Protosulphate of iron | 3 ounces |
| Alum | 1 ounce |
| Citric acid | 1 ounce |
| Water | 20 ounces |
Prevention is better than cure, however; therefore immerse the negatives in the above directly they are taken from the fixing bath. After clearing the negatives, they should be well washed.
PHOTOGRAPHY WITHOUT LIGHT: See Catatypy.
PIANO POLISHES: See Polishes.
PICKLE FOR BRASS: See Brass and Plating.
PICKLE FOR BRONZE: See Bronze Coloring.
PICKLE FOR COPPER: See Copper and Plating.