A method of producing mirrors comprising depositing a reflecting metal layer by pyrolysis on a ribbon of hot glass during the glass production process characterised by applying a metal precursor to the glass ribbon at a location where the glass temperature is above 200 DEG C. The invention also provides a method of producing mirrors during the glass production process, the method comprising pyrolytically depositing a durable reflecting metal layer over the glass surface at temperature of from 200 to 550 DEG C.
