uhh if u get a headache.. happen to me

if u want to kno 4shure buy a test kit
~PLUR~
Unfortunately since lots of pipes have MDxx added to them this isn't an efficient way to tell since they can still test positive.
I don't know about low dose piperazine, but I know when I accidently took pipes, 2.5 of them, I got hot and cold flashes and felt anxious- among other things. I'd say nausea, but I've gotten nauseated from both pipes and MDMA, though I think that the nausea from pipes lasts longer- for me, the entire time. Headache seems to be another good indicator. Also, of course, less euphoria an little to no empathy.
As far as trying to identify a pipe without ingesting it- sour taste can be an indicator, so can a waxy pill texture- but then again, there are good pills that are sour and/or waxy. My best advice would be to see how many of the characteristics a pill has and you can kind of deduce what it is,
maybe. Not always. Like perhaps a weak test reaction plus a waxy, sour pill would be more likely pipes than a bitter, not waxy pill with a weak reaction etc. If course, a strong test reaction is most likely a pill with no piperazine. Also, often, but definitely
not always, bright colored pills seem to be pipes, as well as outpresses. But that is by no means a definite indicator- just a trend that you can see from looking at pill reports.
Unfortunately there is no definite way to tell without taking the pill since there is no test out there for pipes, yet.