Window mounts are the border mount board around a framed item. Window mounts are often a coloured mount board and have an angled cut. The purpose of such window mounts is to lift the glass (or other glazing material) off the art work, so there is a small space between the art work and the glazing material.
Have a look at your window mounts and particularly the angled cut. Is this angled cut a yellowish or brownish colour? If so the window mount board is likely to have become acidic over time and could be causing damage your art work.
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