![]() In turn, keep the dropper bottle in a black plastic bag (or other lightproof container) in the refrigerator. Store the prepared dye in a dark amber glass dropper bottle. Since there are 20 drops in a ml and you will only use 1-2 drops per sensitizing session, 25 ml of prepared dye will last a long time. That is 1g in 100 ml of solvent, or 250 mg in 25 ml solvent. ![]() It is, though, a worthy question to answer. What a dye is dissolved in may change its sensitizing range, but that is not something I have pursued yet, and I'm not sure I will-or, at least, not soon. It is also soluble in water and in ethanol. That was recommended by the service rep at Lab Depot. In addition, I dissolved my PinCl in methanol. "erythrosine") for ortho emulsions, and erythrosin and pinacyanol chloride ('PinCl') for panchromatic emulsions, and Yellow #5 food dye if you want to add self-screening to either emulsion. To the list of ingredients we have used so far, add erythrosin B (a.k.a. Cutting film adds an extra step, as does panchromatic sensitizing. Drying plates or film can take more than a day if the weather is humid. In addition to the three main emulsion making steps, time must be allocated for glass plate blank preparation, and for drying the coated materials. The steps are precipitation, washing, and ripening & coating. They can be completed one after another on the same day, or divided into separate work sessions up to a week apart, according to time available. The basic recipe is divided into three steps. But, artists do need to follow good practices. Their issues may hinge on the fact that the home darkroom is not a factory and artists don't have to be engineers. Once you start making emulsions, you will recognize that the old recipes aren't nearly as mysterious or misleading as is sometimes suggested-often by people you would think should know better. This is also true for most recipes in the historical literature. It is not written for a first-time emulsion maker. ![]() The information in this recipe builds on the experience you have had up to now. The techniques for making the basic recipe are covered in previous tutorials. Developed by Denise Ross for The Light Farm, 2013. ![]()
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