Fine-grain developers formulas

Glycin, used in combination with ppd (Formulas Superfine-Grain Developers DuPont No. 3 Superfine-Grain Developer), makes a fine-grain developer with improved emulsion speed and faster rate of development. Unfortunately, because of the presence of ppd, it still suffers from the unpleasant side effects of high toxicity and staining. 

This is a fine-grain developer with medium to low contrast. The grain is softer than that produced by Kodak D-23. This formula was originally designed to produce fine grain for small format negatives. As with most fine-grain developers it will cause a loss of emulsion speed of at least one stop. 

This is one of the best divided developer formulas for fine grain and full tonal scale. For the first bath you can use classic D-23 or a modified version, given here. This is because when... 

I feel like a white granular mass of amorphous crystals—my formula appears to be isomeric with Spasmotoxin. My aurochloride precipitates into beautiful prismatic needles. My Platinochloride develops octahedron crystals,—with a fine blue florescence. My physiological action is not indifferent. One millionth of a grain injected under the skin of a frog produces instantaneous death accompanied by an orange blossom odor. 

The kinetic models of Jander and Ginstling were developed by Komatsn [11]. He had assumed that the reaction starts in the places of inteigrannlar contact (Fig. 2.7). The fundamental role in the reaction has the number of these contacts, thus the fineness of the mixture. If the number of contacts is constant in time, the formula derived by Komatsu is reduced to lander s equation, in which, however, the k constant is the function not only of the temperature but also the ratio of grains sizes and of both components as well as the content ratio of these components in the mixture. 

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