Extracting morphine from opium is a bitch, mainly due to the nature of the latex and the number of other alkaloids present.
http://www.erowid.org/archive/rhodiu...morphextr.html
Is the easiest way. Buy a Ph meter, you're not gonna squeak by with litmus paper. The resolution of alkaloids is entirely dependant on a small window of Potential Hydrogen Ion concentration atcertain times during the procedure.
Good Luck!
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