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:iSO Tmnsacliovs of S.M.F.E., Vol. XI 11, No. 38, 1929
Table II
Effect of Time of Rinse Between Development and Fixation on
Hardening Properties of a Fixing Bath
Time of Hinse 'Relative Hardening
(M.P.OF.)
0.0 min. . 170oF.
0.5 min ISS^F.
1.0 min. 186or.
2.0 min 188°F.
5.0 min 190or.
2. Factors Influencing the Sulfurization Life. From the curves shown in Figs. 3, 4, and 5, it is seen that (a) for equal concentrations of alum and acid, the sulfurization life increases rapidly as the quantity of sulfite increases, the sulfurization life apparently increasing logarithmically with the concentration of sulfite; (b) for equal concentrations of alum and sulfite, the sulfurization life decreases as the concentration of acid is increased; (c) for equal concentrations of acid and sulfite the sulfurization life decreases only slightly with increasing concentration of alum.
3. Factors Affecting the Developer Capacity. In order to determine the developer capacity (the quantity of developer which can be added to the fixing bath before precipitation of aluminium sulfite occurs) for all of the formulas represented by the various points in the curves shown in Figs. 3, 4, and 5, it would have been necessary to prepare a large quantity of these formulas and determine the quantity of developer necessary to precipitate aluminium sulfite in each case. In was considered desirable, therefore, to find a method whereby the curves already obtained could be interpreted in terms of ''developer capacity." Curves 3, 4, and 5 show that with an increasing quantity of sulfite there is a tendency to precipitate aluminium sulfite, while with an insufficient quantity of sulfite, sulfur tends to precipitate. It is between these two limits that a suitable stable fixing bath exists ; in other words, there is a definite quantity of sulfite which may be added to any given formula which is satisfactory with regard to sulfurization life before the precipitation of aluminium sulfite occurs. It was thought that it might be possible to find a definite relation between this quantity of sulfite and the quantity of developer which would cause similar precipitation. Experiments were therefore made to determine this relation by comparing the quantity of developer in one case, and the quantity