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A clear coating applied over artworks to protect against dirt, smoke, ultraviolet radiation, abrasion, and other environmental hazards that art is subject to. It is also commonly used to change the surface sheen and appearance of colors, so can be regarded as a creative tool. The ideal varnish can be applied without harming the artwork in any way and protect without change so long as it was required. Unfortunately there is no ideal varnish. We are fortunate to have better choices than fifty or more years ago. Modern varnishes generally perform better than their predecessors, however wisdom needs to be excercised when making choices. If there is no way of ever removing the varnish then it should not be used except for temporary work.
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