Basically you can display Woodblock Print in the proper environment without changing color for a long time (more than 10 years).
But, Never do the handling such as follows, because it will causes a change of color and the deterioration.
If a woodblock Print is exposed to direct sunlight, it hastens a change of color and the deterioration. So, please display at a shaded place in a room.
Do not wipe a woodblock Print directly with water or any kind of liquid, because it causes the change of color.
* For the methods not to use liquid at all; dry wiping, whisking, or blowing,
If you perform it without giving big pressure on the woodblock Print directly, that is acceptable.