Which test kit is that? There are several. I'm assuming you mean the "Ecstasy, Amphetamine, 2C-B" kit, aka the Marquis kit?
2C-B should react green. DOB also reacts green though and I believe some others do too. Often you can cross-test between several kits to narrow down your results, I'm not sure if you'll be able to do that in this case though.
When you get it, remember to take a 1mg allergy test - if this is DOB you might get a significant trip from it. If it's 2C-B you won't really feel anything at this dosage and it'll at least rule out a super potent DOx. (if you dosed 20mg of DOB thinking it was 2C-B you'd probably be in hospital or dead!)
That said, if your friends have tried it at 2C-B dosages and lived, and weren't tripping for 3+ days after a single dose.. It's safe to say it wasn't DOB. You still want to take an allergy test dose though, since it's very rare, but occasionally some people react badly to a certain drug.
If it reacted green, was taken at 2C-B doses, and was found to be very nice it probably was 2C-B. It's a wonderful drug, and I'm sure you'll love it.
We have a
Big & Dandy 2C-B Thread which Fagott already linked. That's where questions like these belong really - as such, once you've had a chance to reply I'll merge this thread with that one.
Happy tripping, and welcome to Bluelight since you're new
