Process for obtaining a decorative mirror

A process for obtaining a decorative mirror comprising reflective regions forming a pattern and non-reflective regions, said process comprising:

• providing a sheet of soda-lime-silica glass coated with a reflective coating on the entirety of one of the faces thereof, then
• applying a composition comprising a phosphate salt to said reflective coating coated on the glass sheet, solely in application regions, said application regions being intended to become the non-reflective regions, then
• after applying said composition, tempering said glass sheet in a tempering furnace, in which said glass sheet is subjected to a temperature of at least 550° C., said composition comprising a phosphate salt completely dissolving the reflective coating in the application regions during said tempering in the tempering furnace so as to form, after said tempering, said non-reflective regions in which the glass sheet is not coated and a tempered glass sheet comprising said reflective regions and said non-reflective regions,
• wherein the reflective coating comprises at least one functional layer that is a metal layer or a layer of a metal nitride, or
• wherein the reflective coating is an alternating stack of thin high-refractive-index dielectric layers and of thin low-refractive-index dielectric layers.