[Neuroscience] Re-crystallising dextran rhodamine

[Trevor Lewis]

Does anyone out there have experience re-crystallising dextran 
rhodamine? I have been given some dextran rhodamine where the crystals 
have all sort of 'melted' together (from poor storage) and so needs to 
be dissolved and recrystallised. I expect it is probably straight 
forward, but I haven't done it before so thought I would ask for any 
tips / tricks.
Thanks,

Trevor