When knocked constantly or put in an area of reverberation, the chalk particles will fall from the paper. Even when sprayed with a fixative, the chalk cannot be guaranteed to adhere to the paper surface. Therefore, it is extremely necessary that these fragile works of art be undisturbed as much as possible and handled as little as possible. Sunlight is extremely dangerous to all works of art and pastels should not be placed in direct sunlight. Spacers are used to separate the matting from the pastel work. This space provides a 'well' for any chalk to fall and disappear from view instead of discoloring the matting. Humidity is also not a friend of pastel works.
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