I wondered, if its possible to do a coldwater extraction "without" water? Meaning: Is there a solvent (which you can obtain easily) which solutes codeine but no acetamophin or asprin? I read that codeine doesn't like heat, so boiling of the water after filtration would probably be a bad idea. A volatile solvent could give you pretty easy the pure brown (?) powder. Thus giving you the exact yield, and if it's too poor you can extract again. If you have your powder then, where to keep - bevcause of light etc. And are there any differences between the codeine salts (sulphat, phosphat)?