How should I store a white-handle katana to prevent ito discoloration?
Updated Mar 2026
White silk or cotton ito wrapping is particularly susceptible to yellowing from UV exposure, humidity, and skin oils transferred during handling. For long-term display, position the piece away from direct sunlight and fluorescent lighting with high UV output - both cause fiber degradation over time. If you handle the tsuka during repositioning or cleaning, use clean cotton gloves to avoid transferring oils to the white wrap. For storage in a cabinet or display case, maintain relative humidity between 40-60%; levels below this range can dry out the same (ray skin) under the ito, causing it to contract and affect the wrap's tension. A light cedar block placed near (not touching) the saya can help regulate moisture without chemical risk to lacquer finishes.