utility liquids
Utility liquids are used to prepare a color or protect a work of art.
fixative 
Transparent solution in liquid or aerosol form applied to protect a drawing in charcoal, chalk, pastel or pencil.
turpentine 
An essential oil obtained by the distillation of natural resins and used mostly as an oil paint thinner.
linseed oil 
Oil made from linseeds; it acts as a binding agent so that pigment adheres to a surface.
varnish 
Preparation with no pigment; when applied to a surface, it forms a protective film.