This instructable will show you how to make a lava lamp form household ingredients.
There was once a instructable how to make one, but it was not quite good. You can still find it here: http://www.instructables.com/id/EJCIH9CHRMEYF8MQ68?ALLSTEPS
I'll try to make it quite simple and I have photos and a movie (my own even :)!

This project will cost you dearly: about about few promiles from few promiles of your monthly sallary. And will consume an enormous amount of time, like... 15 minutes.

I always loved lava lamps, but buying one was just a little bit beyond me so I've decided to make my own.

So let's go!

Please note, aside from this instructable being my first one, I'm not an native english speaker so any comments pointing out mistakes are welcome.

I'm still thinking about a stand, so the bottle will be warmed and lighted up by a light bulb.

UPDATE: the water-colours were a "not-so-quite-good" choice. See the last step. Also the brush I used to mix the paint with the water left some of it's hair.

UPDATE 2: The "dust" in the last step is not from the water colours. I was from the calcium tablet.
Also warming up with a halogen lamp fails to produce the desired lava lamp effect (the base was (about 48 deegres Celsius hot). I still don't know if it's the effect of the calcium sediment or the water-oil combination just won't work.

LAST UPDATE: The oil-water combination just dosen't work. Sorry - this is a "one tablet - one go" instructable.
-KungPow-5 years ago
 do you have to keep adding alka seltzer?
Dzwiedziu (author)  -KungPow-5 years ago
I you want to keep it going, then yes. But at some point the mixture will become saturated with with the tablet's remains. A this point I don't know if it will work any more.
 aww thats too bad... does anyone know how to build a lava lamp that stays going by itself?
there's also another way with benzilic alcohol, and salty water (4.8 % of salt), with tis method you must use the bulb under the bottle otherwise it doesen´t work YOU CAN SEE THE RESULTS HERE: http://www.youtube.com/watch?v=aQEvSLmi0tk&feature=related
Yes, http://www.youtube.com/watch?v=3u6JE3TKBg4 and http://www.youtube.com/watch?v=SZbMmH-y8hY&feature=related made with mineral oil, alcohol 70%, alcohol 95%, oil based coloring, and trementin
twisted8 years ago
This will only work as untill teh tablets disolve. correct?
i would really like the answer to this question too does it only make bubbles until the tablets dissolve?? what if u use a closed container plz reply
Dzwiedziu (author)  twisted8 years ago
It should also work when heated up. That's what I aim for, but as for now I'm lacking materials and time :/
Sweet, I've made several attempts @ a lava lamp, but none of them were successful =(

One question: Will you get big blobs eventually, or will these micro-blobs perpetually float and sink?
Dzwiedziu (author)  T3h_Muffinator8 years ago
The blobs will later go down and form a larger one, and those with CO2 will go up (if you leave the bottle open). But those are observations on a cold bottle only :/
Since it's probably been a decent amount of time, could you post pics of the larger blobs etc? Perhaps even a video??
Dzwiedziu (author)  T3h_Muffinator8 years ago
Unfortunaetly I didn't get them :/ I don't have the materials to build a proper bulb housing. But shaking a cold bottle only makes the small ones... There will be a small update mabye later today (GMT +1 of course ;), because the water-colours have appeared to be a bad choice :/
snipegoat8 years ago
its awesome personaly i like the small blobs, because you spin it around a bunch and it looks awesome (exspshaly when its heated)
zus8 years ago
Yeah i have the same question will they ever become blobs ? Nice instructable tho good work