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Frame a Chalk Pastel Artwork
Pastels can be sealed with a spray before framing to minimise the smuding and dust dropping onto the mount - framers should get the artist to do this themselves as it can slightly darken the colours in the picture.
Another tip is to make a ‘gutter mount’ - a second window mount with a slightly bigger aperture behind the first window mount to create a space for the dust to drop into.