Not sure on what colour to add to my yellow wax lamp.

[Ian]

Hello everyone. 

I got my first lamp about 3 years ago. 

It was green liquid and yellow wax. 

I restored it and it's working fine. 

Using this link: 

http://www.moltenmeditation.com/lava-lamps.html

Thing is it's now only yellow, 

Not sure what colour to add to it, 

Do I just use normal food colouring?

Is it best to add food colouring while it;s cold? 

Not sure, thanks. 

[Ian]

This is the green one when I got it. 

[URL=http://s53.photobucket.com/user/dadcav/media/dadcav038/P1020249_zps213d28af.jpg.html][IMG]http://i53.photobucket.com/albums/g74/dadcav/dadcav038/P1020249_zps...[/IMG][/URL]

This is one I'm getting for Christmas. 

[URL=http://s922.photobucket.com/user/ultrapower10/media/DSC00737_zpsn1ayeemw.jpg.html][IMG]http://i922.photobucket.com/albums/ad67/ultrapower10/DSC00737_zpsn1...[/IMG][/URL]

This is the green one thats now yellow. 

[URL=http://s922.photobucket.com/user/ultrapower10/media/DSC00764_zpslafnqkje.jpg.html][IMG]http://i922.photobucket.com/albums/ad67/ultrapower10/DSC00764_zpsla...[/IMG][/URL]

[URL=http://s922.photobucket.com/user/ultrapower10/media/DSC00762_zpsrp0w78bc.jpg.html][IMG]http://i922.photobucket.com/albums/ad67/ultrapower10/DSC00762_zpsrp...[/IMG][/URL]