Thermoforming is the most important traditional production technique of Boshan colored glaze. The craftsmen use the fluidity, plasticity and visco-extensibility of colored glaze to instantaneously model and process melted glaze liquid into the desired shape. Because of the special nature of glass, the time interval from liquid to solid product is fleeting, so craftsmen need to race against time and finalize the shape of colored glaze in a short time.