Thanks for your feedback. I read that someone address this problem to the glue which isn't dried. Someone suggest to put the voyage under the sun. Yesterday I was all the day on the beach and my voyage was in my bag; the day was very hot and I left it there. When I returned home I noticed that the gradient effect was sligthly lesser noticeable. I attach here a photo, the left was taken yesterday night, the right was the photo which I posted in a previous post. All the photo were taken with the kindle brightness level at 24.
Maybe the effect of that is due the hot and high temperature?
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