The purpose of fusing is to assemble several pieces of superimposed glass so that they can form a homogeneous piece thanks to a very precise firing: they are brought in an oven at their melting point. Controlling cooking is very important: from 455 degrees, the glass begins to lose its consistency, then at around 800 degrees, the glass begins to melt, and the different superimposed glass plates then begin to merge. The glass plate is baked at this temperature for about 24 hours.