NO direct sunlight. Avoid near proximity to windows. Be wary of placement near direct lighting. I'm not sure of different types like, CFL, etc. Other people might have better ideas.
The type of pen used on the ball also would determine how long an autograph lives on a ball. There's a type of pen that seemed to be in common use at card shows in the late 80's til at least the mid 90s, that dissipates into nothing visually. I used Bic pens in the late 80s that still look good.
Sometimes, its the leather on the balls. Good luck. Witster
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