CS>CS storage ?

[ESL555]

  Does it matter if cs is stored in plastic containers ? One cs website says 
cs must be stored in glass because plastic cannot preserve the cs in liquid 
suspension for any length of time. The cs I make with my silver puppy seems 
stable and clear. If I decide to sell the cs should I put an expiration date on 
it 
? Any other things I should know if I want to sell cs ?
Thanks
Steve