I admit this is a rather strange question but 
there are some multilayered cels I own I could 
swear they got moldy.
If I hold them in a special angle against the 
light it looks like there are "water drops" 
between the layers. If I lift the above layer it 
also stinks a little.
You can also see darker spots on the cel.

Have these cels really got moldy? And if it's so, 
should I do anything against it or should I leave 
the cels as they are?

Greetings
Dennis