The subject of the invention is a process for manufacturing red glass containing copper that comprises the steps consisting in: obtaining a mass of colorless molten glass, free of sulfides, the iron oxide weight content of which is between 0.01 and 0.15%; then conveying said mass of molten glass in a feeder channel, in which copper oxide and tin oxide are added to said mass of molten glass, the partial pressure of oxygen in said mass of molten glass being between 10.sup.-7 and 10.sup.-4; then forming glass objects, especially bottles or flasks from said mass of molten glass; then subjecting said glass objects to a heat treatment so as to develop a red tint.