Dear users,

I'm currently working with multiple epoxy resins, but after curing on ambient temperature, i can't determine which one is A-stage and which one is B-stage, which is very important.
The B-stage epoxy only partially cures and this one needs to be cured a second time to gain full conversion.

Now my question is, how do i determine which one is the B-stage? i have a lot of material all over the place and it isn't really pointing itself out.

Thanks in advance,

Frenk