Varnish, a versatile product.
Varnish is first and foremost well-known for its good protection, extra-matt varnish ensures that the painted surface retains its "matte" look. Varnish also ensures that the paint is no longer porous, so the surface is resistant to water and dirt (such as dirty fingers).
Of course, the classic way of coating a layer of varnish over the paint is perfect, but it can also be mixed with the paint. Resulting in special effects, for example, if you mix varnish with white Decoration paint you will get the white wash look. Mixed with a different colour, you get the colour wash look. You can experiment in all sorts of ways with this product.