This is small gift I made for my girlfriend for Valentine's day. :) Blue is her favorite color. So I decided to make something that is really blue.

First idea was to make copper sulphate crystals (https://www.instructables.com/id/Grow-Crystals/) So i was started making crystals but i failed. :( After two days i only had some small crystals and 2oz of that strange blue liquid you see in picture left...

There was only 2 hours before midnight left, and I decided tomorrow i must gift something to my girlfriend! Then I started thinking and idea shot straight to my head. I grabbed my instructables MagLite and just lighted to bottle with that solution...

This time my failure became succes!

Step 1: Get 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 gun
Soldering iron
Dremel or drill

Step 2: Making the Mysterious Liquid

I filled my bottle with copper sulfate solution I made from CuSO4 x 5 H2O salt. You can buy the salt at your local department store. ;)

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

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

Step 3: Make 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 4: Complete Everything

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

Step 5: Overview

Thats it! I made it! :D Small shiny blue night lamp with a heart. :)
Only two hours from idea to finished thing! :) Sure you can make blue bawls concept lamp with light sensitive switch or something much better.
But that is enough for me. :)

However my girlfriend was very happy. ;)