Varnishing
This is done to enhance the appearance, texture or durability of a printed sheet. Matt or gloss machine varnish means a thin oil-based coat applied on a printing press. 'UV varnish' is a heavy, high gloss varnish applied after printing, and cured in an ultra-violet dryer. Either type of varnish can be 'spot' or 'overall'.
Vegetable oil based inks
Calverts uses Bio inks. Sometimes described as vegetable inks, or soya inks, they are mineral oil free. Also, they are very low in chemical catalysts, including heavy metals, which are routinely added to many inks to accelerate drying.
Vignette
This term usually refers to a graduated tint.
Visual
See Design Visuals.