2. As the last, but adding red oxide of iron, 1/2 dr. Less decisive.

3. Copper dust and litharge, of each 2 oz.; nitre, 1 oz.; sand, 4 oz.;

'flux' or 'frit,' q. s.

4. From transparent 'frit,' any quantity; oxide of chromium, q. s. to

colour. Colour superb; it will stand a great heat; in common hands,

however, it frequently turns on the dead-leaf tinge.

5. Transparent 'flux,' 5 oz.; black oxide of copper, 20 to 40 gr.; oxide

of chromium, 2 gr. Resembles the emerald.