How to Grow Alum Crystals

Written by ehow hobbies, games & toys editor
  • Share
  • Tweet
  • Share
  • Email

Alum crystals form as attractive glasslike squares. Add different shades of food coloring and grow numerous crystals to make a colorful alum-crystal garden.

Skill level:
Easy

Other People Are Reading

Things you need

  • Nylon Threads
  • Glass Bowls
  • Glass Jars
  • Pencils
  • Glass jars
  • 2 oz. alum or more

Show MoreHide

Instructions

  1. 1

    Heat 1/2 c. water almost to boiling.

  2. 2

    Remove from heat.

  3. 3

    Pour into a bowl.

  4. 4

    Stir in alum slowly. Add in more until the alum is no longer dissolving but is starting to settle at the bottom of the bowl.

  5. 5

    Pour a small amount of the solution into another bowl.

  6. 6

    Allow to cool. Once cool, you should see small crystals forming.

  7. 7

    Take out one of the crystals and allow it to dry completely. This is your "seed" crystal, or the place from which the rest of the crystal will grow.

  8. 8

    Tie one end of a piece of thread around the crystal, and tie the other end around the middle of a pencil.

  9. 9

    Prepare another solution, repeating steps 1 through 4.

  10. 10

    Pour the solution into a glass jar.

  11. 11

    Place the pencil over the jar so that the thread hangs down into the jar and the crystal is suspended in the solution.

  12. 12

    Place a paper towel over the top of the jar to keep dust from getting into the crystals.

  13. 13

    Allow several days for the crystal to grow.

Tips and warnings

  • You can find alum in the grocery store, in the section for spices or canning.
  • Make sure to supersaturate your solution. This means continuing to add the alum and stir it in until the solution is saturated, and the alum begins collecting on the bottom of the dish.
  • If the thread hanging from the pencil is too long when you place it in the solution, just roll the pencil between your hands until the thread wraps around it and the length hanging down becomes shorter.

Don't Miss

Filter:
  • All types
  • Articles
  • Slideshows
  • Videos
Sort:
  • Most relevant
  • Most popular
  • Most recent

No articles available

No slideshows available

No videos available

By using the eHow.co.uk site, you consent to the use of cookies. For more information, please see our Cookie policy.