I have just been reading a moderately accurate, if slightly sensational and misleading, document on GHB which I freshly downloaded from this newsgroup (hint, hint). I have gotten to the part that says that one of the problems with GHB is knowing how strong it is (true) and that there is no cheap way of checking the strength (false). It is VERY simple. Put it in the oven and heat to something over 100 C degrees (boiling point of water). When all the water is evaporated, you are left with just GHB (assuming it has been made proberly). If you are worried about purity, just heat it up more, to the boiling point of Gamma ButyroLactone which I THINK (can't find the reference) is about 240 C degrees (if you are American and don't know what degrees celsius is - LEARN). This will drive off all remaining of that stuff. Once that is all boiled off and if the temp goes up a bit more, the GHB will also evaporate. You don't want this so take it out of the oven. When you are left with pure GHB (a white wax), rehydtrate it in boiling water to your desired concentration (or take it as a solid - harder to measure accurately). It is very easy to do and anyone that says otherwise is probably working for the FDA or the CIA (protecting their market share). -- Greg Amiga user since 1988 and Nootropic (smart drug) enthusiast.