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23 July 2009 @ 03:56 pm
Science question....  
My nephew's having a Harry Potter party for his birthday next month and we were going to do a 'Divinination' class. We have goldfish bowls for the crystal balls and Sis had the idea of having colours in the glass so that it looks like there's a 'vision' coming through. Does anyone have any ideas of how that might be done? We tried adding food colouring to ice cubes and putting them in the bowls full of water to melt but it didn't really work because it just fills the bowl rather than having wisps.

Any suggestions?
Current Mood: curiouscurious
lwbush: Candy Heartlwbush on July 23rd, 2009 03:06 pm (UTC)
Perhaps food color in oil would work - like the old lava lamps. I have no scientific knowledge that was how they were done - that's just how it appeared.
the girl who used to dance on fire and brimstone: reading makes me happy - refutedwhiskyinmind on July 23rd, 2009 03:08 pm (UTC)
Thanks honey - I just checked and she says she's tried it but it didn't really work.
Snagnestdweller on July 23rd, 2009 03:15 pm (UTC)
Any way to put a light source under them with colored filters, then employing dry ice for the fog in the crystal balls?
the girl who used to dance on fire and brimstonewhiskyinmind on July 23rd, 2009 03:17 pm (UTC)
We're actually having trouble finding anywhere we can get dry ice from. Good idea though!
Snagnestdweller on July 23rd, 2009 04:42 pm (UTC)
Perhaps a party store sells chemical fog machines? Pump the fish bowls full of the chem fog and then seal 'em up so that the fog doesn't escape.
Wolfram D. Scottwaddis on July 23rd, 2009 04:43 pm (UTC)
If you have fine threads of any kind, you could get small lengths of it (two or three inches each) and tangle little bundles of it. Think those nasty clutches of dust and hair you might find while sweeping.

If you don't have colored threads, you could soak the threads in food coloring of various colors.

Add some milk to the water to give it some murk, then put a bunch of different colored bundles in. The added density from the milk ought to let them either sink or get neutral buoyancy. When you stir the mixture, if it's murky enough, you ought to be able to see little flashes of color from the sides as the bundles of thread come around.
the girl who used to dance on fire and brimstonewhiskyinmind on July 23rd, 2009 04:52 pm (UTC)
Wow - that sounds fantastic! We'll give it a try tonight!

(just realised I never friended you back! Fixing that now!)
Wolfram D. Scottwaddis on July 23rd, 2009 05:09 pm (UTC)
No probo. I hope it helps.
velvetwhipvelvetwhip on July 23rd, 2009 06:26 pm (UTC)
That last idea sounds awesome.

draconindraconin on July 23rd, 2009 10:52 pm (UTC)
I'm wondering if adding gelatin to the water might help re the dye diffusing too rapidly instead of 'threading'? ie add much less than the recommended amount that gives a solidly set jelly so that you have a jelly that's not set but makes the water quite viscous. You'd probably have to experiment.