Dear List-Members

Not really an Histology question, but related. A colleague, who is working with diets for fish larvae wants to put fluorescein (FITC)as a marker in the food (microcapsules) for fish larvae, and after to measure the fluorescence. She would like to store the samples in some way until the measurements of fluorescence. The question is, does fluorescein would be afected by the storing of the sample? (she said to me she could freeze, freeze-dry, or maybe fix, in this last case, what would be the best fixative?). I have never worked with fluorescence, so I decided to ask the experts. Any advice will be welcome.

thanks in advance 

Jos#233# Luis