[DLVMCTS]

I bought orange oil to use as a paint thinner, the problem is that it's orange!
I tried to distill it by putting a jar of it (with some water, read somewhere that it would lower the boiling point of the oil (is that true?)) in a bath of boiling water. I got some oil out of it but probably not Limonene which I'm after. Even if I could increase the temperature it isn't a very efficient method anyway.
Is there another way of getting the colour out of the oil, decompose it maybe? I think what makes the colour is b-Carotene.

[voidSetup]

Did you just put the jar in the bath of boiling water open to the air?  You need to collect the distillate that comes off the the mixture.  It should be a mixture of limonene/water and I believe should separate into two layers.  If it's not two layers then you would need to add some non-polar solvent like ether.  The limonene should move into the ether, you separate the layers, and boil off the ether.

[DLVMCTS]

Yes, I collected the distillate. I got a few drops of something, probably some of the other terpenes. I guess it wasn't warm enough then.
But since it probably is just one compound I want to get rid of, isn't there a better way than to distill off everything else?

[DLVMCTS]

I put some bleach in it, that made it worse. the oil looks like orange juice now.

http://en.wikipedia.org/wiki/Bleach#Mechanism_of_bleach_action