The feedstock is probably fine. I mean you are going to add I2 to it anyways, right? It does not really go bad, not in six weeks anyways. Oh yeah, why on earth are you leaving I2 sitting out anyways. It will sublime away, and that sucks, just wasted time and money. Its also bad for you, just a tad bit of I2 exposure will make you feel like shit( painful urination, hard to piss, and general feeling like shit). From now on, put the damn shit in a bottle or something, its for your health. It may not seem important now but, later on, years from now, you will be all fucked up, if you dont start taking some safety procautions. I sadly, know from expirience.
Good luck fellow Bee, may you always bee prosperous.