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Easy Crystals to Grow

Easy Alum Crystals Project


This is a crystal of alum, a kitchen spice.

This is a crystal of alum, a kitchen spice. Alum crystals are easy to grow and can become quite large.

Anne Helmenstine

Are you looking for an easy, safe, reliable crystal-growing project? These alum crystals may be the easiest crystals you can grow.

Why This Project Rocks

  • non-toxic crystal (alum is a grocery story spice)
  • uses hot tap water, not boiling water
  • easy to do - mix and wait
  • extremely reliable results - crystals will grow
  • only requires a few hours for good crystal growth
  • results in crystals large enough to pick up and examine

Grow Easy Alum Crystal

To grow these crystals you will need:
  • 1/2 cup hot tap water
  • 2-1/2 tablespoons alum
Simply stir the alum into the water and wait for crystals to grow. Alum crystals usually are visible within a half an hour and reach a good size within a few hours. It's that esay! When the crystals are to your liking, use a fingernail to scrape them off the side of your container. You can examine them and keep them.

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