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When green glass is wanted, limestone is used. Both amber and emerald green glass consist of the same materials as the green batch, but to the amber, coke, charcoal, manganese, ferric oxide, sulphur and salt must be added, while the emerald green is completed with coke, sodium bichromate and cobalt. Glass melts at a temperature of from 2500 to 2700 degrees Fahrenheit. During the melting and refining processes, constant watchfulness is required. One problem is to keep the coarser elements from separating from the finer ones in the batch. Another is that of the viscosity of the molten glass. This is kept at the proper point by keeping the temperature at approximately 2000 degrees with the aid of an optical pyrometer. At this temperature it is at the proper consistency to be fed from the feeder into the machines. Here is one of the warehouses in which Whitall Tatum Company bottles are stored pending shipment. The storage capacity runs into millions of bottles. Dry storage is an unusual but necessary feature in bottle manufacture, for long ago, we discovered that glass subjected to to the elements tends to deteriorate. Strangely enough, moisture is particularly to be avoided. Gasoline and electric tractors fly in and out of these long aisles, stocking fresh supplies or carting them away to the nearby rail siding.