It could be the way they are processed and made.. Let's put it this way...
I was on 3 60mg Oxy's a day.. the generics right? They say OC on one side and 60 on the other... well Purdue pharmaceuticals that makes the generics use this new reformulated stuff that is literally impossible to break... the pill is hard as rock and doesn't crush, boil down, nothing... in fact it feels like when chewing it that ur chewing into a very hard VERY hard piece of Styrofoam or cardboard....
Bottom line, when you take them Orally... they do NOT do CLOSE to as much as the OC's.. actually i forgot to mention, the new formulated ones say OP on them instead of OC and are a tad bit larger.. but same color.... ITS BULLSHIT I TELL YOU!!!....
So here's what I would say... I think that you Blue ones might be substance abuse protected or w/e.... to prevent people from insuffalating them.. Have you done that yet and had any problems or do you just take them regularly?.. If you just take them regularly and are getting that no affect compared to your old hydrocodones.. or norcos or w/e u have, than it's probably been reformulated...
Hope this helps... sorry for the babbling so much ;-)