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Gum Tragacanth 

Available from art stores and mail order.

Two ways to prepare mixture:

1. Mix one tablespoon gum tragacanth with one quart hot (not boiling) distilled water. A blender or mixer will speed up the mixing process. Let stand 24 hours. If air bubbles rise, wipe off with the edge of a strip of newspaper. Add another quart of water when ready to marble.
2. Fill an 8" x 1 0" x 2" deep pan with hot water. Sprinkle gum powder on top so that a fine layer covers surface (1 tsp. to 1-2 pints of water). Mix until powder is dissolved, repeat twice more. NOTE: Gum tragacanth doesn't sour as Carrageenan does. Starch keeps for long periods.