Glaze Painting
 
A glaze in painting pertains to a layer of paint,
made thin with a medium,so as to turn out to be fairly transparent.
The painting
technique of glaze alters the color cast or texture of the
surface. The drying time is based on the capacity of medium used
in the glaze , a higher ratio of medium to paint (producing a very
thin, transparent glaze) reduces drying time, while unadulterated
oil paint takes the longest time to dry. For numerous centuries
painters have applied glazes to their works.
Oil Painting:
In oil painting, the simplest form of a glaze is a thin, oily,
transparent layer of bright color applied over the top of a lighter,
thick under painting that is dry to the touch. Light penetrates
all the way through the glaze and is reflected back off of the
under painting. This causes a shining effect akin to glancing at
a brightly lit white wall behind a film of colored cellophane.The
thin oily layers of a glaze are easy to use, facilitating the depiction
of detail.
Usually lighter colors reflects additional light. Titanium white
reflects more light than any other pigment. Hence the glaze spread
over a titanium white underpainting will probably fully utilize
reflected light to bring out the glow in the glaze. But in most
situations, the underpainting consists of a range of pigments with
varying degrees of reflectivity. This is going to have parallel
behavior on the functioning of the glaze.
Additionally, Titanium white is also the most thick of the three
common whites used in oil painting, the other two being zinc white
and lead white. Zinc white is the least opaque, hence it is preferred
for use in mixing a color for use in a glaze, whereas titanium
white represents the ideal choice for use in the mixtures used
in the underpainting.
Wall glazing:
When the glazing technique is used for walls, the whole surface
is covered, frequently displaying traces of texture (French brush,
parchment, rag rolling). In a good number of cases, oil-based or
water-based materials are utilized for glazing walls, based upon
the desired effect. Kerosene or linseed oil can also be used to
extend the working time of oil-based glazes. Water-based glazes
are on occasions thinned with glycerin or another wetting agent
to widen the working time. Usually, water glazes are ideal for
rougher textures where overlaps of color are adequate.
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Technique
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