Blind_Angel, thank you for your help, I greatly appreciate it.
Gringo, why are you assuming that I haven't done my required reading? If you will refer back to my first post on this subject, you will see that I questioned if a pseudoephedrine extraction technique would be appropriate. And your explanation of the distribution of contents in a pill is a generalization at best, and certainly not of any help to anyone here. Perhaps you should do more reading before making the incorrect assumption that I haven't, or that I don't know the techniques.