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"While a glaze does not always procure the mellowness that might be supposed, bear in mind the consequences that are always threatened by the nature of the composition. At first the glazing is transparent; and you have it quite to your wishes. But time passes, slowly & imperceptibly, but not less surely, the material is undergoing a chemical alteration; and as certainly will darkness follows the day when the Sun is down, so certainly will discoloration, and what is infinitely worse, obscuration, supervene to tints that look at first so magical, suspended in these oily washes.  It is [[crossed out]] therefore [[/crossed out]] then with distrust, but not aversion, that you are to look upon the powerful aid afforded by glazing to the charms of painting; not abjuring totally its use, but employing it with due restriction, sparingly & always with circumspection."   Handbook.