Varnishing an oil painting serves both protective and aesthetic purposes, making it an essential final step in the painting process. Firstly, varnish acts as a protective layer. It forms a transparent barrier over the surface of the painting, helping to protect it from dust, dirt, moisture, and minor scratches. This is especially important over time, as environmental factors can gradually damage the exposed paint surface. Secondly, varnish enhances the appearance of the painting. Oil paints often dry unevenly, causing some areas to appear dull while others remain slightly glossy. Applying varnish restores the richness of the colours, deepens tones, and improves overall contrast, making the artwork look more vibrant and visually cohesive. In addition, varnish evens out the surface finish. Without it, a painting may have inconsistent patches of matte and shine. Varnish creates a uniform finish across the entire surface, whether the artist chooses a matte, satin, or gloss effect. Anoth...