I do CWE wit 30/500 codeine 500 mg paracetamol and always evaporate the liquid to see the amount of codeine I am left with. I know some binder and some APAP gets through but I am a little paranoid about just drinking the liquid. The problem is it just welds itself to the plate that I evaporate it on and end up having to scrape it off the plate with a stanley blade and I can never get all the powder off the plate. Any one got any suggestions on how to combat this. I currently have one on the go that I have poured the liquid onto some greaseproof paper and it is sat on top of the boiler which is warm enough to evaporate it slowly 2 days in this weather over night in the winter when the heating is on