The Dictionary Of Photography

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

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Development and Developers
Fixing Bath. Hyposulphite of soda ...        ...        ... ... 4 ozs.
Water.................. 20 ,,
Leave in this for at least 5 minutes, and then wash thoroughly for an hour or more. To secure greater brilliancy and dissolve away any deposit caused by impurities in the washing waters, the transparency should be immersed for 2 or 3 minutes in some of the following clearing solution contained in a dish, using fresh for each plate. The transparency is afterwards to be well washed for ten minutes : -
Alum .................. 1 oz.
Citric acid         ... ... ... ... ... I ,,
Water ... ... ... ... ...        ... 20 ozs.
If, from an error in the exposure or want of quality in the original negative, the lantern slide or transparency is still wanting in sparkle, through the high lights being veiled, it may be effectually cleared either at this stage or after being dried, by using Mr. Howard Farmer's reducer, made as follows : -
No. 1. Ferridcyanide of potassium ... ... ... 60 grs.
Water ... ... ... ... ... ... 20 ozs.
No. 2. Hyposulphite of soda ...        ... ...        ...        I oz.
Water ... ... ... ... ... ... 20 ozs.
For use mix No. 1 and No. 2 in equal proportions. Place the transparency in a dish and flood it with the solution ; the dish must be continually rocked and the transparency carefully watched, and removed instantly the highest lights are cleared, which will not usually take more than 1 or 2 minutes: it is then to be again well washed before being dried. This reducer is in practice very useful, but requires using with great care, as it is capable of dissolving away the whole of the image, should the transparency be left in too long. When thoroughly washed, the lantern slides or transparencies should be allowed to dry spontaneously, and are then ready for binding or mounting in the usual way. If desired, they may be previously varnished, using crystal varnish.
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