[Histonet] Storage of 10M NaOH

[Eva Andersson]

Hi,
Maybe not a strictly histochemistry question but maybe someone could 
provide me with an answer.
I was just told that I shouldn't store the 10M NaOH that I use for 
adjusting the pH in a glass bottle. I was told that it needed to be made 
fresh and only kept in a plastic bottle. Why is this? How long can I 
keep a stock solution?
If anyone has any ideas please let me know.
Eva