Thanks for all the good suggestions. I've 
currently had all my cels neatly slotted in cel 
folders. And stored in my cardboard, which is 
dark enough. But at times, I do have the 
tendencies to bring it out and admire at those 
beautiful works. And now, I've noticed some line 
fadings on cels that when firstly bought, have 
never had any. It was barely a year...

I'll try to store them in huge thick cardboard 
box like what mouse suggests. I think that should 
help a lot. And thanks to everyone for 
contributing. Your advice is greatly appreciated. 
^^