Glazes allow light to penetrate the layers and enhance color. They also permit the artist to construct the painting in stages. I use a glaze 'medium' (the liquid to add to the paint) of oil (stand/linseed or the like) varnish (resin/alkyd) and sometimes a little white spirit (turpentine). Modern alkyd lacquers dry rather quickly and may be retarded with more oil or speeded up with the white spirit.
Student Activity: Make a list of other common products you think might be oil based and therefore compatible with oil. Also nominate those common oil based products that are slow drying and those that dry quickly. The student should also place some small pools of various oily substances on a sheet of glass outside and over a number of days observe the different drying times.
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