[GreenKeys] Ribbons that don't dry out?

[Charles]

I have two model 33's that see very occasional use. So the ribbons always 
seem to be dried out when I want to play with them, especially on the outer 
few turns that are exposed to air and room light.

Is there any type of ribbon that has some kind of dry-transfer ink? Or is 
the only cure to seal it in a plastic bag with one's favorite re-activation 
potion...
thanks
Charles