Both colour and glair, therefore, should always be handled very neatly; nor are beautiful things made by any other means than by clarifying and selecting the preparations. Now if you mean to handle them so, have a very clean platter in which you may always prepare the glair; and it must not be soiled by any other employment, but reserved for this alone. Many, it is true, do make glair in a basin; but they are ill-advised, for glair is turned greenish by bronze. Indeed, any liquid, if it remain for any length of time in a bronze vessel, will be altered in color, and even robbed in part of its natural odor. Prepare, furthermore, a small whisk made in the shape of that sign - (a round stick of limber wood the size of a finger in the part which stands for the stem; but the other part, which is like a circle, is not to be spherical, but flat, and thin enough to be bent) - with which you will beat the glair.
True, glair is beaten by a good many people with a spoon, or with a little stick somewhat curved at the end; but they are not well-advised, for unless glair is well beaten colour cannot possibly be tempered with it properly; and with implements like those it hardly gets beaten, if at all.