. . . . . "Nowadays, approximately 60 out of the 90 oxygenates or oxides found in the world are used for the composition of the mixture or batch, together with decolourising agents and colouring agents or ingredients such as iron oxide, cobalt oxide, copper oxide and gold; fluidifying agents such as soda; stabilisers such as lime, refining agents designed to make the glass homogeneous and intermediants such" . .