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step 1Get stuff
Parts:
1 - Bottle with cap
3 - Blue leds
1 - 9v Battery
1 - 9v Battery clap
1 - ON/OFF Switch
Some wires
Enought liquid to fill bottle


Tools:
Knife 
Hot glue pistol
Soldering iron
Dremel or drill


step 2Making the mysterious liquid
I filled my bottle with copper sulfate solution witch i maked from CuSO4 x 5 H2O salt. You can buy it at local flowers shop. ;)

There is a lot of different colors salts. Ammonium cobalt sulfate is shiny red, potassium dichromate deep red, ammonium dihydrogen phosphate is green. You can find best colors experimentally.

Well you can paint your liquid, but playing with chemicals is more dangerous and fun. :D 
BY CAREFUL COPPER SULFATE IS HARMFUL! 
I added some small shiny tinsel in a solution. They make my liquid more freezing.;)


step 3Make the cap
Design is very simple just:

1. Prepare your bottle cap.
2. Drill hole and place 3 leds in it.
3. Glue leds with hot glue.
4. Solder your leds and switch.
5. Connect leds with a battery.
There is schematics.

You can add some crystals like i did. ;)


step 4Complete everything
Just make some nice facing. I used copper wire for making a heart and added Myliu Tave "I love you" in my language. :)

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