Okay so this is easy, you should have all the chemicals you need around the house!
You'll need around 5-15 copper coins and a straw, put these aside afterwards
Get a clear jar and scoop 2 tablespoons of salt and 1 tablespoon of baking soda into it
Now the most important ingredient is ammonia, you can find in most bathroom cleaning supplies (any brand, just check it has ammonia) and pour into the jar untill it's about 2/3 full or as tall as you want your crystals!
The last ingredient is laundry bleach, fill the rest of the jar but watch out for your clothes!
Now drop those coins from earlier into the bottom and quickly grab the straw and start to blow bubbles onto the coins!
You should see crystal growth after about 30 seconds of blowing! That's it!!
The attached pic I took is from about 10 minutes of steady blowing
The pinkish purple colour comes from the copper-calciphate and CO2 in your breath!
Blowing until you feel dizzy isn't recommended but it increases the CO2 in your breath, spreading the possible colour variety!
Good luck!! :)
