Tuesday, December 16, 2008


I got a special request for this recipe! Be patient because this project takes time, but it will result in a beautiful crystal suspended on a string!
Have Fun!!
Crystals on a String

2 Tbl. alum
4 Tbl. alum
1/4 Cup hot water
2 Cups boiling hot water
2Large Glass jars
Coffee filter
String or Pipe cleaner

  1. In a bowl, add 2 Tbl. alum to 1/4 cup hot water, and stir until alum completely dissolves.
  2. Pour mixture into a saucer, and let stand until liquid evaporates (1-2 days).
  3. The evaporated mixture will leave a number of Crystals behind. Choose one of the longest, best formed crystals, and carefully tie a length of thread around its middle. Set is aside in a clean, dry place.
  4. Bring 2 cups of water to a boil
  5. rinse out a clean glass jar with hot tap water. (You are pre-heating the jar to prevent it from cracking during the next step.)
  6. Add the 4 Tbls. of alum to the jar, then slowly add the boiling hot water until the jar is 3/4 full. Stir until the alum dissolves. Then allow the mixture to cool
  7. Strain the mixture through a coffee filter into the second glass jar.
  8. Lay the pencil across the top of the jar, and tie the thread with the previously formed crystal on it to the pencil. The crystal should hang inside the jar, near the bottom but not touching it.
  9. Wait for a large alum crystal to form.

This is not recommended for younger children, because they tend to have trouble waiting for the end result. This is best for Kindergarten and up age children!

Send me an email if you have any questions! Have fun!!


  1. Thanks! This was an awesome project!

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