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GP-2 Holography Processing Kit - 1 Liter - The GP-2 developer is the latest formulation by Dr. Tung H. Jeong of Lake Forest College. The GP-2 developing procedure is most suitable for the Russian-produced fine-grain emulsion now known as PFG-03M.
Both the developer and the emulsion are discussed in the book "Silver Halide Materials for Holography and Their Processing" by Dr. Hans Bjelkhagen and published by Springer-Verlag. The book and the materials are distributed by Integraf LLC, Holography Supplies Source, 218 Main St #674, Kirkland WA 98033 (Phone: (650) 351-5003, Fax: (650) 351-0013, E-mail: (Info@integraf.com).
Note: All chemicals are dangerous and must be treated with respect. Please read all the warning labels on each package. It is good practice to use eye goggles, dust mask, apron and rubber gloves when mixing chemicals. Hydroquinone is considered by the EPA to be hazardous, and to be a skin sensitizer. Keep from children. Label the packages clearly as poisonous materials not to be consumed.
Keep the stock solution in a tightly capped bottle and label it as "GP-2 Developer, Stock"
When refrigerated (not frozen), this solution should be good for one year; If it becomes yellow, dispose of it