How to prevent the photos in the photo frame from changing color? The signature photo I put in the frame found that some places turned blue. Why is this and how to prevent it?

Precautions for photo preservation: 1, sun protection and direct sunlight do great harm to photos and may fade in a short time. 2, moisture-proof, in the case of high humidity, some photographic paper will become blurred in the case of high humidity. 3, radiation protection, radiation here refers to ultraviolet rays, microwaves, etc. , depending on whether you have these devices in your storage environment.

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