- Keep them sealed in the original bag and box until use.
- Room temperature (about 50–90°F / 10–32°C), away from heaters and direct sun.
- Low humidity: damp air makes toner clump.
- Lay them flat, the way they ship, not on end.
- Keep a spare, not a stockpile: one or two per printer is enough; toner keeps for years but cartridges age (does toner expire).
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