Step 6: Time Passes
You can keep your crystal shape growing indefinately, by adding more water/salt solution to the bowel.
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1) You said the ammonia was optional, depending on humidity, etc. I live in one of the rainiest cities in America so it's always very humid here, so would that make the ammonia more or less important?
2) If I wanted to make little kits as gifts, where I pre-mixed the solution and kept it in a bottle, do you know if it would keep and for how long?
Thanks! BTW, great instructable!
Also, any scientific reason as to why this happens? Very interested in the process.