Putty

a white powder obtained by calcining an alloy of equal parts of tin and lead. The substance thus procured is true or genuine putty; it constitutes the base of most of the opake enamels, and is used in giving a polish to metals, stones, and gla . It is usually supposed that glaziers putty was originally composed of this genuine putty and oil; at present, however, it is nothing more than washed chalk or whiting mixed up with linseed oil; a kind of ductile paste is thus produced which is highly serviceable in fastening panes of gla into sashes, as it becomes hard after a few days exposufe to the air.