D-limo works great, just say know! As long as it is pure and nothing added to it. Here is a pic of the stuff I use!

I found some 100% d limonene (advertized as being 100% pure, how trustable would an advertisement be on ebay for example? it has a very good feedback rating but i want to make sure i get the right stuff. it's so far the best price i can get in regards to 100%)

Also does anyone think that this method can be used with other sources that can be extracted using an STB (i believe Q21Q21's tek was an STB, correct me if i'm wrong)? If there's very little info on this i'm going to experiment with random acacia's. I'd really like to see if it would work using A. Acuminata.