Practical guide to photography by Marion & Co. (London)

Author:Marion & Co. (London)
Language: eng
Format: epub, pdf
Tags: Photography
Publisher: London : Marion and Co.
Published: 1885-03-25T05:00:00+00:00

lU PRACTICAL GUIDE TO PHOTOGRAPHY.

paper prepared as required. "We will give first that known as the borax bath.

The tube of chloride of gold which contains fifteen grains is dropped into a pint bottle. A glass rod is taken and the tube is broken with it. Fifteen ounces of water are now poured over the chloride of gold, and the bottle is labelled " Chloride of gold solution; one grain to the ounce."

When we are about to tone we count our prints and calculate how many sheets of paper there are, or how great a fraction of one sheet if we have been printing only a few small proofs. This is for the sake of finding how much toning solution we ought to mix up. For each sheet of paper measuring 17x22 inches we take ninety grains of borax, which should be in the form of a poAvder. On this Ave pour a few ounces of hot water to dissolve the salt. "We noAv make up with cold Avater to fifteen ounces, and add one ounce of the stock solution of chloride of gold.

This forms our toning-bath. It must be mixed Avithin an hour or so of the time Avhen it is to be used, as it does not keep Avell. Care must, moreover, be taken not to add the gold Avliile the borax solution is still very warm, or the gold may be throAATi down.

All the processes in connection Avith toning and fixing of prints must be performed in a light not strong enough to act upon them. The best arrangement of all is to have a yellow light for all processes except that of toning, for Avhich white light is necessary to enable judgment of the colour to be made. It is quite possible, hoAvever, to perform all the processes in a Avhite light so feeble that no hurt Avill come from its use.

The first operation is to Avash the prints. If a special

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