Advice sought: effects with water effects

[waitwhat]

I'm looking to try and make some terrain with non-water water effects by which I mean things to give the impression of chemical mixing and reacting, iridescant diesel, glowing translucent green radiation, that kind of thing.

Anyone got any experience or suggestions for how to achieve any of these? Expensive stuff to practice with and can't screw up the final pieces.

[has.been]

Small amounts, e.g. spills from oil drums, I use two part epoxy resin & as it starts  to harden mix
in a bit of ink or thinned paint.  Stir (as much, or as little as you want) Leave it to harden.
For larger amounts, such as polluted ponds, there are quite a few tutorials on the internet including
LAF.

[snitcythedog]

if you are using clear resins then you can mix inks and thinned acrylics in to color the whole batch.  For the iridescent sheen the only thing that I can think of is this stuff.  http://www.greenstuffworld.com/en/chameleon-acrylic-paints/737-chameleon-colorshift-royal-burgundy-paint.html.  Problem is I have not used it so I cant give you any information on how it thins out or how translucent it is. 
Hope that helps.
Snitchy sends.

[Brandlin]

Those colourshift paints only work because you have a solid black (preferrably gloss) undercoat. And its the change in viewing angle that gives the colour change. Mixing them into resin will just give you a murky colour.

[waitwhat]

I'm wondering if I need to use some actual oil they smeared on top of dried resinq to get the effect