Mix water with a few drops of food coloring. The more food coloring you use the brighter your color will be. Then slowly add the water mixture to Baking Soda, just enough to make a pasty dough.
Form clumps or “rocks”, set aside to dry for a few hours.
Variation—let children use pipettes to drop the vinegar in by the drop, pour all of the vinegar on the rocks—how long does it take to dissolve totally!
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