May 19, 2010· I believe they have Gypsum in Perth, try Chinatown. Anyway to be safe, I better buy another packet before I move to Perth! Wendy, I'm not too sure how you compare GDL to Gypsum but from the recipe that Mrs. Buffalo provide, it seems that 1/2 tsp Gypsum powder = Approximately 3/4 tsp to 1 tsp GDL or Lactone or Pectin.
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