. The book of photography; practical, theoretical and applied. s advisable. Rodi-nal is very rapid in operation, but th;^negatives lose strength considerably in th(fixing bath, and this must be allowed form of rodinal is obtainable asa powder, which simply requires dissolv-ing in water ; it is sold under the nameof Unal, and is very convenient for usewhen travelling. Pyrocatechix. No. 1. —Pyrocatechin 96 grs Sodium sulphite ... 360 Water 10 oz. No. 2. —Potassium carbonate 1 oz. AVater 9 oz. For use, take 1 part of No. 1 and 2 partsof No. 2. Pyrocatechin gives bright, clearnega
. The book of photography; practical, theoretical and applied. s advisable. Rodi-nal is very rapid in operation, but th;^negatives lose strength considerably in th(fixing bath, and this must be allowed form of rodinal is obtainable asa powder, which simply requires dissolv-ing in water ; it is sold under the nameof Unal, and is very convenient for usewhen travelling. Pyrocatechix. No. 1. —Pyrocatechin 96 grs Sodium sulphite ... 360 Water 10 oz. No. 2. —Potassium carbonate 1 oz. AVater 9 oz. For use, take 1 part of No. 1 and 2 partsof No. 2. Pyrocatechin gives bright, clearnegatives of satisfactory printing its properties and results it is not unlikehydroquinone, but does not keep very wellwhen made up. It is a favourite with somefor the development of portrait negatives,although equally suitable for most otherkinds of work. It is tolerably rapid inaction, and requires dilution in warmweather. Adurol. No. 1. —Adurol 85 grs Sodium sulpliite ..: .. Ifoz. Water 10 oz. No. 2 —Potassium carbonate H oz. Water 10
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