[code:1:1d0242e9bc]1) What does it mean "saturated solution of lye (NaOH)"? [/code:1:1d0242e9bc] NAOH dissolved until water is fully staurated (no more NAOH can dissolve in it). But I doubt it is needed, this would mean a huge amount of lye (around 1 kg for one liter) [quote:1d0242e9bc]2) Which ammonia I can use? Can I use 5% liquid ammonia, which I can buy in drugstore? [/quote:1d0242e9bc] If it's only ammonia+water, yes. But it is quite useless to wash with ammonia if you freeze precipitate. [quote:1d0242e9bc]3) And also we dont have here, in Russia VM&P Naphtha, so can I use Petroleum Ether?[/quote:1d0242e9bc] Theorically yes, but Petroleum Ether can also be 'heavy' Petroleum Ether. Better check if there is no residue after having evaporated 100 ml.