Coloured glass is obtained by mixing of colored salts. Addition of
__________ oxide is done to impart greenish blue color to the glass.
(A) Chromium
(B) Arsenic
(C) Copper
(D) Manganese
__________ oxide is done to impart greenish blue color to the glass.
(A) Chromium
(B) Arsenic
(C) Copper
(D) Manganese