Details?

Processed, how? What sort of fluorochromes (I assume) are used? 

Generally speaking, storage in cold and dark can help to give you some extra time for completion of analysis... for a few several days. But then, never cross-compare the absolute signal from one chip to another - only the ratio of internal standards will have meaningful value.

Come to think of it, contact the maker of the chip, surely they will provide you with the information. 

Once it is read there is no need to reuse it as the data you received at the time of chip reading were the best expressed those signals will not be the same if you store them 

if necessary store in dark with date mentioned so that during retrieval the date can suggest the depreciation of the signals  

But if it is unread, then after how many days data can be retained?