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How-To Crystal Egg Geodes

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default How-To Crystal Egg Geodes

Post by Adrian on 25th August 2011, 12:41 am

Linky



Tools and Materials
Blown-out eggshell (Get the How-To)
Alum powder
White glue
Small paintbrush
Plastic or glass container
Egg dye
Hot water
Craft stick or spoon
Latex gloves
Drying rack or newspaper

Crystal Egg Geode How-To
1. Start by blowing out a large white chicken egg (Get the How-To) and splitting it in half, lengthwise. The egg can be cracked by striking it against a surface or cut with a small pair of scissors. Make sure the inside of the eggshell is clean and dry.

2. With a small paintbrush, apply white glue to the inside and cracked edges of each half of the eggshell and sprinkle with alum powder until completely coated. Set eggshell halves aside to dry overnight.

3. The next day, prepare your growing solution in a glass or plastic container by using a craft stick or spoon to mix 2 cups of very hot water (almost boiling) with an entire packet of powdered egg dye. Be sure to wear latex gloves to protect your hands from the dye. (Tip: Liquid food coloring can also be used to dye the geode -- 30 to 40 drops will adequately saturate the solution.)

4. Add 3/4 cup of alum powder to the hot dye bath and stir until completely dissolved. If there are remaining crystals in the bottom of the container, place the solution in the microwave for a few minutes to dissolve them. This will prevent alum from being drawn away from the geode.

5. Once the alum is completely dissolved, let the solution cool slightly (for about 30 minutes) and then submerge one of the dried, alum-coated eggshells in the growing solution, allowing it to rest on the bottom of the container with the inside of the shell facing up.

6. Set the container aside in a safe place overnight to allow the crystals to grow undisturbed. (Tip: The longer the eggshell is in the solution, the larger the crystals in the geode will be. Twelve to 15 hours will usually result in a perfect geode.)

7. The next day, remove the geode from the growing solution very carefully (as wet crystals are quite fragile), being sure to wear latex gloves to prevent the dye from staining your hands. (Tip: If you are not satisfied with the size of your geode crystals, return the geode to the growing solution and wait a day or two. As water evaporates from the solution, more alum will be deposited in your geode, increasing the size of the crystals.)

8. Place your geode on a drying rack or newspaper and allow to dry completely before handling.

9. To grow a second geode in the other half of the eggshell, simply re-dissolve the crystals remaining at the bottom of the growing solution in the microwave and follow the instructions above starting at step 5.

Additional Tips
Geodes can be grown without using egg dye. The resulting crystals are clear to milky white, like quartz.

While large chicken eggshells are suggested in this process, larger eggshells can be used. Simply increase the size of the plastic or glass container and double or triple the amounts of dye (1 packet), alum (3/4 part), and water (2 parts) used to create the growing solution.

Resources
If you don't want to blow your own egg or would like to try a larger eggshell, pre-blown shells are available from The Eggery Place. Alum is available at most grocery or drug stores but can also be purchased online from Talas. Powdered egg dye is available from Surma: The Ukranian Shop.

Ready-made Crystal Egg Geode kits available from Professor Figgy's Fabulous Science Kits at professorfiggy.com.

Via Martha Stewart.com.


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Adrian
Founder and crotchety old git who wanders around in a threadbare dressing gown muttering

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default Re: How-To Crystal Egg Geodes

Post by polgara on 25th August 2011, 8:57 am

How good is that?

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polgara
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default Re: How-To Crystal Egg Geodes

Post by mr_sfstk8d on 25th August 2011, 12:35 pm

Akin to the process of making Rock Candies. Except you wouldn't want to eat it, lol.
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mr_sfstk8d

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default Re: How-To Crystal Egg Geodes

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