Oki C110 Instruction Manual page 76

Important!
Do not touch the PC drum on the imaging cartridge.
Position the removed imaging cartridge horizontally as shows in
the illustration at the right.
Be sure to keep the imaging cartridge horizontal and place it where
it will not become dirty.
Do not leave the imaging cartridge removed for more than 15
minutes, and do not place the removed imaging cartridge in a
location where it would be exposed to direct light (such as
sunlight).
76 - C110 User's Guide