-> Oil Painting
painting is done on surfaces with pigment ground
into a medium of oil — especially in early modern Europe,
linseed oil. Other oils occasionally used
include poppyseed oil, walnut oil, and safflower oil. These
oils result in different properties in the oil paint,
such as less yellowing of different drying times. The oil
usually takes weeks to dry.
It was probably developed for decorative or functional purposes
in the High Middle Ages. Surfaces like shields — both those
used in tournaments and those hung as decorations — were more
durable when painted in oil-based media than when
painted in the traditional tempera paints. Many Renaissance sources
credit northern European painters of the 15th century with the "invention"
of painting with oil media on wood panel —
Jan van Eyck often mentioned as the "inventor". The popularity
of oil grew in 16th century Venice, where a water-durable medium
Recent advances in chemistry have produced modern water miscible
oil paints that can be used with, and cleaned up
in, water. These are still "real" oil-paints in every
sense of the meaning. Small alterations in the molecular structure
of the oil creates this water miscible property.
A still-newer type of paint, heat-set oils, remain liquid until
heated to 265–280 °F (130–138 °C) for about
15 minutes. Since the paint never dries otherwise, cleanup is not
needed (except when one wants to use a different color and the same
brush). Although not technically true oils (the medium is an unidentified
"non-drying synthetic oily liquid, imbedded with a heat sensitive
curing agent"), the paintings
resemble oil paintings and are usually shown as oil paintings.