Bauhaus-Universität Weimar

The Book of the Lantern. Being a Practical Guide to the Working of the Optical (or Magic) Lantern. With Full and Precise Directions for Making and Coloring Lantern Pictures.
Hepworth, T. C.
Neutral potassic oxalate 
Sal ammoniac 
Water (distilled) 
f Iron sulphate 
g } Citric acid ... 
C Water (distilled) 
9 m • 
» • • 
• • • 
I * • 
2 ounces. 
40 grains. 
1 pint. 
4 drachms. 
1 pint. 
For use, pour a portion of B into an equal quantity of A. 
If the operator is accustomed to the ferrous oxalate 
developer pure and simple, he will find that it will develop 
this description of plate, but it is better for being restrained 
with a few drops of 10 per cent, solution of sodic citrate. 
Whether he use one or the other, let him be particularly 
careful in the matter of cleanliness of fingers. A hypo- 
defiled finger will spoil the developer instantly. To avoid 
this disaster,—the potency of which I have learned by 
sad experience,—I have adopted the following method of 
working :— 
I use a brilliant yellow light, so that I can work comfort- 
i ably, for chloride plates are, as already stated, insensitive to 
yellow rays ; the developing tray stands in front of it, and at 
one side is placed a large tray filled with water, to which a 
little alum solution has been added. Hypo is, for the pre¬ 
sent banished from the scene altogether. I expose my plate, 
and put it into the developing solution. In a few seconds 
the picture flashes out in the unceremonious manner com¬ 
mon to chloride plates. I hold it up to the light, look 
through it, and find that it is but a ghostly image after all. 
I expose another plate in an adjoining room, and put it by 
the one which is in course of development, and which by 
this time has most likely gained sufficient density. If it 
has, I wash it for a few seconds under the tap, and drop it


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