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Hi Karine,
If you use DIN glass or a nonreflecting glass from other manufacturers you really don't see it. I tell my clients that pastels are made of the same pigments as oil paint yet they don't crack or discolor with age. They do have to be protected by a sheet of glass though. I remember seeing a de la Tour pastel and a Chardin self-portrait pastel at the Louvre the last time I was there. They looked as fresh as if they had been painted the day before, at 250 years old that's pretty good. I don't remember noticing the glass.
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