The layer of oil paint is porous, and airborne particles can bond with the drying oil and any varnish applied long ago. You must look for signs of vulnerability before you touch the surface.
Protecting Your Art: Preventing Varnish Damage in Oil Paintings
Use a soft, clean brush with natural bristles to sweep away loose dust from the surface and the grooves of the paint. Addressing Stubborn Grime and Varnish If the painting has been displayed for decades without protection, it may be covered in a layer of old, yellowed varnish.
The Science Behind the Dirt Before reaching for a cloth, it helps to understand what is actually clinging to the surface. When Moisture is Necessary: Surface Cleaning Sometimes, dust has bonded to the oil and requires a mild solvent to release its grip.
Protecting Varnish While Removing Years of Grime
Distilled water is the safest starting point, as it contains no minerals that might leave spots behind. You should approach the canvas as if you were dusting a rare book, prioritizing gentleness over speed.
More About How do you clean an oil painting
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