When a transparent coat of oil paint is placed over a solid coat, the color of the original paint is changed. An example of this technique would be to place a transparent coat of crimson over a solid coat of blue that has been dried, with the result being somewhere between purple and mulberry. The results of this technique vary according to the thickness of the glaze and the tonal intensity of the original color.
Glazing is not used today because the technique does not assure that the final color intended by the artist will continue to be evident. An example of what happens when the glazing wears off is the painting "Countess of Albemarle", that was painted between 1757 and 1759 by Reynolds and is now in London at the National Gallery. The original flesh tones produced by the glazing method have faded dramatically, leaving a very dull monochrome underpainting.