What are the expiration periods and proper storage conditions for pens and ink ribbons?

Expiration period
A length of time from manufacture during which it can be used normally. 2 years, if unopened. Check the month and year of manufacture on the package or ink ribbon.
Storage conditions
1) Temp./humidity: 10-30°C, 30-65%
2) Location: Away from direct sunlight. Color changes, evaporation, deterioration, or other phenomena may occur depending on storage method and period.