The Answer is c
I hope this helps
Answer:Varnishes provide a non-porous layer which prevents dust and dirt from being embedded in the more porous paint layers beneath. If and when the painting needs to be cleaned, the varnish layer can be easily removed from the painting, along with the dust and dirt that has accumulated on top.
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i thought it gives off light but now i dont know i think its wet its not :/ a coincidence
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