Argy-Rousseau is made using the pate-de-verre technique. This technique allows for greater control over the shape and, more importantly, the colour of each piece. It is a time-consuming manufacturing process that relies on the meticulous placement of glass paste that contains finely crushed glass crystals, a binding agent and metallic oxides which provide colour. Depending on the type of glass paste it could be sculpted cold but was generally placed in a mould. The glass paste would then be fired at very carefully controlled low temperatures to cause the paste to vitrify whilst ensuring that the different colours didn't run into each other.