There are different kinds of varnish, all of which have their own advantages and properties. A cartonboard surface is varnished to protect it against scratches or to stop it getting dirty. Varnish can also be used to emphasise the gloss of a design in whole or in part. The varnish is either applied to the cartonboard directly in the printing press or afterwards in a separate operation. Printing varnish – an oil-based varnish which is spread on in a printing press. Protects against scratches. Emulsion varnish – is spread on in the printing press at a varnishing station. Protects against scratches. UV varnish – is spread on either directly in the printing press or in a separate varnishing machine. Gives a glossy surface.