The Dictionary Of Photography

A True Historic Record Of The Art & Practice Of Photography 100 Years Ago.

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Eikonogen
No. 2. . For instantaneous work (about ^V-sec. exposure). For this purpose formula No. I is to be used, with the exception that the crystallised carbonate of soda is replaced by the same quantity of carbonate of potash.
No. 3. For very short instantaneous exposure, or for increasing the power of Nos. 1 and 2 for under-exposed plates.
Sodium sulphite ......... ... 5 parts.
Carbonate of potassium ... ... ... 2 ,,
Eikonogen............... 1 part.
Boiling distilled water ... ... ...      30 parts.
The following is the formula for   the fixing   baths recom-mended : -
Hyposulphite of soda ...        ... ...        4 parts.
Bisulphite of soda ... ...        ... ...        1 part.
Distilled water ...... ......      20 parts.
Or
Hyposulphite of soda ...        ... ...      20 parts.
Sulphite of soda (crystals)...        ... ...        5 ..
Distilled water ... .........     100 ..
Sulphuric acid (sp. gr. 1*845)        ... ...        1 part.
For bromide paper it is advised to soak the paper after exposure in 40 parts of water, and when limp add 10 parts of No. 3 solution ; if the image hangs fire add more of the solution. For over-exposure reduce the quantity of Solution 3. Bromide of potassium should not be used. After developing wash well, and place in an alum bath for several minutes, whereupon it is again fixed and washed. The author has used the following with good results : -
No. 1. Eikonogen ... ... ... ... ... 40 grs.
Sodium sulphite (crystals)... ...... 40 ..
Distilled water ... ... ... ... 10 ozs.
No. 2.
Soda carbonate ......
Caustic potash Distilled water
... 400 grs. ... 50 .. 10 ozs.
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