Whether the shiny precipitate can be redissolved or not is an important observation. If not: bad. If yes: good Also one can check if the shiny precipitate can be used for streak-seeding in new drops. If not: bad/neutral. It yes: good. A bad shiny precipitate also often forms a large connected skin which can be revealed if you drag a needle through it - microcrystals do not.
Poul On 10/06/2010, at 08.06, joybeiyang wrote: > > Hi everyone, I am preparing a "crystallization manual" for our group, > however, I found that it is very difficult to distinguish microcrystalline, > quasicrystalline and precipitation, especially when the precipitation was > shiny, like the grit on the beach. Is there a way to distinguish the three? > > Comments and suggestions will be greatly appreciated! > Joy
