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Oxides of Metal- added to basic flux to make various colored enamels -transparent cobalt blue- from black oxide of cobalt and powdered flint glass other blues obtained by using smaller proportions of oxide of cobalt turquoise and greens from oxide of copper - reds- from gold oxide - soft grays- platinum -yellows- uranium and antimony - purples-maganese [[manganese]] -white- oxides of tin - rich black- iridium - in opalescent colors, more oxide of tin added to increase opacity 60 or 80 mesh(like table sugar or salt 200 mesh(like flour