Eastlake's Methods and Materials of Painting of the Great Schools and Masters
Eastlake, Sir Charles Lock [One-time President of the Royal Academy], Methods and Materials of Painting of the Great Schools and Masters [Formerly titled: Materials for a History of Oil Painting]. Vol. One. New York; Dover Publications, Inc. 1960 [Originally published by Longman, Brown, Green and Longmans in 1847]
Thin scumblings with a vehicle [or with the mere colour] much diluted with spike oil or other essential oil, will not become horny, but, on the other hand, they may easily be washed off, and therefore require to be fixed with a varnish of some sort. An oil varnish, or mere half-resinified oil, may be used in this case--an essential-oil varnish is in danger of removing the tints unless the surface be first protected with a thin glutinous film. For example, a wash of beer fixes the surface sufficiently to bear a varnish. A thicker glutinous medium is not advisable, as it is apt to become white with the varnish. On the whole, perhaps, an oil varnish is safest for recently painted pictures. [pp. 365-366]
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