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Cr2O3. (131.58% Cr2O3) - Since Cr2O3 becomes 2CrO3, oxygen is captured from its surroundings, so the ratio is greater than 100%. Source: Digital Fire. Chromium oxide mainly produces the green color in glass in any type of burning environment. Very heat resistant and very strong colour. Oranges and reds are produced in low-alumina, high-lead, low-fire glass materials. The yellow color is obtained in a glaze containing low-fire lead and soda. In combination with tin, pink specks of chromium and tin are created. Irritating to skin, dust in large quantities is toxic.