liquid motion timers (aka density timers/toys) What's in them? Answered
You know those liquid motion toys you often find at places like Spencer gifts in which a denser liquid (usual bright colored) drips down onto a spiral and you can watch this discrete bubble ride on down?
I'm wondering what's inside them and if its feasible to make your own. I've heard lots of things, that the clear liquid is usual a light oil and the colored part is water. I've heard the reverse, I've also heard that there is no water in these things that both are different oils.
any help would be appreciated. if your still wondering what im talking about heres a place that sells them : http://www.officeplayground.com/spiraltimer.html