I knew that =) (the patent states 262-263° for the HCl salt). the 20 mg/mL figure is also true, but remember that solubility varies widely with temperature - it's not really an accurate method of measuring it, although from experience good k dissolves somewhat slowly (but uniformly; if any dissolves instantly, that's cut).
some k is definitely cut, some "isn't", but i think it still is. someone i know is sure no one can tell if it's cut 20%. i disagree with this, since it's probably coming to him cut, and adding sugar only reduces the potency further.
the logic is simple. the half-gram vials they sell here should be enough to k-hole 5 times. often they aren't enough to k-hole at all. therefore, it's cut.
one other thing -- your melting point test. i suppose if you had a thermometer that went to 266° (which is somewhat of a specialty item; my lab thermometer only goes to 150°, but they have 450° ones too) you could do melting points; but you need to make sure the thermometer is recording the same temperature as the surface the sample is on. this is normally done with a block of some good conductor of heat (i think the fisher-johns apparatus uses either aluminum or iron) with a hole for the thermometer drilled into it. the thermometer is probably embedded in thermal compound. now -- in theory, you could use Raoult's law to calculate exactly how much K there is in a cut sample by measuring the melting point depression, provided you knew what it was cut with. obviously, a sample that melts below 266° is cut. i'd be surprised if you found a drug that melts over 266° -- most organic compounds, including salts, decompose at that high a temperature, and all the other drugs i know melting points for are well below 200°.
some k is definitely cut, some "isn't", but i think it still is. someone i know is sure no one can tell if it's cut 20%. i disagree with this, since it's probably coming to him cut, and adding sugar only reduces the potency further.
the logic is simple. the half-gram vials they sell here should be enough to k-hole 5 times. often they aren't enough to k-hole at all. therefore, it's cut.
one other thing -- your melting point test. i suppose if you had a thermometer that went to 266° (which is somewhat of a specialty item; my lab thermometer only goes to 150°, but they have 450° ones too) you could do melting points; but you need to make sure the thermometer is recording the same temperature as the surface the sample is on. this is normally done with a block of some good conductor of heat (i think the fisher-johns apparatus uses either aluminum or iron) with a hole for the thermometer drilled into it. the thermometer is probably embedded in thermal compound. now -- in theory, you could use Raoult's law to calculate exactly how much K there is in a cut sample by measuring the melting point depression, provided you knew what it was cut with. obviously, a sample that melts below 266° is cut. i'd be surprised if you found a drug that melts over 266° -- most organic compounds, including salts, decompose at that high a temperature, and all the other drugs i know melting points for are well below 200°.
