finally found something on the colors.
From somewhere else on the web swims not allowed to link.
"i say your sons will not get robbed for it because other types of amphetamines are drugs
of choice because breaking up a concerta
is a pain... they are made to not crush and the inside has 3 diffrent layers... take one of your sons pills and break it in half with a razor... the darkest color is just a kind of plug to push out the other two layers that are the medication... the medication and the plug are bolth a kind of gak substance and it will not crush at all"