Silvering of Glass by Spray Process

Silvering of Glass by Spray Process Materials required Float glass, Chemois leather, distilled water, Sulphuric acid, Formaldehyde solution, Silver nitrate, Liquor Ammonia, Sodium Hydroxide, Dextrose, Spray gun (Connected to a pressurized air tank), Mirror backing paint. Tank for housing glass. Preparing the glass: – Take sheets of float glass of required sizes. – Clean the surface of the glass of dust, finger grease or any oily substances – Wash the glass with distilled water. – Clean the glass with chemois leather & dry. – Keep the glass in slightly slant vertical position on wooden frames across an empty tank (To collect excess & drained silvering solution) Preparation of silvering solutions Solution A – Add 250gm of Silver Nitrate in 500ml of distilled water. – To this add slowly 250ml of Liquor Ammonia. Watch for the solution to take a light grey color and then turns out clear. (Care must be taken to while adding Liquor Ammonia) – Stop adding Liquor Ammonia when the solution turns clear. – Prepare a solution of sodium hydroxide of about 125 gm in 750ml distilled water. – Both these solutions are to be mixed in 20 litres of distilled water & to be store in a plastic or glass container. Solution B – Dissolve Dextrose 125 gm in 500 ml water. Add 5ml of formaldehyde solution and 5ml of sulphuric acid. (Take ample care while adding Sulphuric acid) – Dilute to 20 litres with distilled water & to be store in a plastic or glass container. Solution C – Dissolve 5 ml of tin chloride in 10 litres of distilled water & to be store in a plastic or glass container. These solutions can cover up to 400 square feet. Keep both the jars separately & away from each other. Procedure – Spray tin chloride solution on the glass. – Draw a tube from solutions A, solution B & connect them to a double nozzle spray gun (connected to a pressurized air tank). Apply spraying from the bottom of the glass from side to side till you reach the top. – Allow all the excess solutions to drip into the tank Wait for few minutes allowing the solutions to react & form a thin later of silver on the glass. – Use dry chemois leather to dab excess solution from the surface of the glass. – Apply a thin coat of mirror backing paint using a spray gun. Sn2+ (aq) + 2 Ag+ → Sn4+ (aq) + 2 Ag (s).

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Silvering and Re-Silvering Mirrors & How to Make Your Own One-Way Mirror Solution No
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