Carrageenan is a natural seaweed gelling agent that provides viscosity for marbling on fabric. The carrageenan solution should be mixed at least 12 hours in advance. In blender or food processor, put 1 quart of warm water and slowly sprinkle 1 teaspoon of calgon and 2 teaspoons of carrageenan with blender running. Blend well and pour into tray. Make as many batches as needed until tray is filled about 1 1/2 deep.
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