Fixative
Fixative is used to prevent changes to a painting after it is completed. But, there are fixatives that can be removed should you need it.
Using fixative is choice, because the colour and values of dry mediums like pastels and pencils can be affected by the application of fixatives.
Fixatives can be applied with a brush (typical for oil paintings) or as a spray (airbrushing or spray can).
If you want to preserve a painting made with pencils or pastels, rather have it framed behind glass then it will remain beautiful for years.
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💗 Linzé
