PROFESSOR OF INDUSTRIAL CHEMISTRY, COOPER UNION; MEMBER OF THE FIRM OF TOCH BROTHERS; AUTHOR OF CHEMISTRY AND TECHNOLOGY OF PAINTS; MATERIALS FOR PERMANENT PAINTING, ETC., ETC. The observant visitor to the great art galleries is astonished and pained to see the large number of pictures of the highest artistic excellence gradually being ruined on account of decomposition as shown by fading, darkening, cracking and peeling of the paint films. This is all the more deplorable because the cause of the deterioration is well known and pigments, vehicles, canvas, in fact all the materials needed by the painter to make absolutely permanent paintings are equally well known and require only in…
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