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This is our very own Texas rock that grows delicate crystals just by adding vinegar. You can add food coloring to change the color, otherwise they come out white. Instructions are included. The process takes anywhere from a few days to a week depending on your local weather. The crystals grow on the surface area as the vinegar evaporates. A great experiment for all ages.
  The item # is texrock
  The price is $3.00 per rock