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DCG Recipes

141 bytes added, 22:17, 16 May 2013
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== Introduction ==
Ralston Rallison introduced a notation for basic recipies recipes for dichromated gelatin emulsions. He use a sequence of three numbers that indicated the quantities of dichromate, gelatin, and water, respectively, used in the formulation. For example, 5-30-200 in RalsonRallison's scheme meant 5 grams of dichromate with 30 grams of gelatin and 200 grams (exactly equivalent to ml) of water made up the recipe. The normal for RalstonRallison's notation was 30 grams of gelatin, while the dichromate and water ratios were allowed to vary.
Many amateur holographers use common food-grade gelatin in their work. ''Knox Gelatin '' is the most typical. In the United States, Know Gelatin is available in convenient 1 ¼ oz. packets. An ounce is roughly 14 28 grams, so it can be convenient to express Ralston Rallison recipes using a 14 7 gram (quarter ounce) reference for gelatin instead of the more common 30 grams.  Common Ralston Rallison recipes then become:
<center>{| width="200" class="wikitable" border=1
| ! Ralston Recipe| !! Rescaled Recipe
| 5-&mdash;30-&mdash;250 || 2.3-14.250&mdash;7&mdash;58
| 10-&mdash;30-&mdash;600 || 4.4-1402007&mdash;7&mdash;140

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