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Why Do Edges of a Mirror Turn Black?

Why Do Edges of a Mirror Turn Black?

The Science Behind Your Mirror

If your mirror is turning black around the edges, you’re observing a chemical reaction in your home. Mirrors add a classic touch to every room, but unfortunately, they are not immune to the wear and tear of time. Black edges detract from the beauty of your mirror, which is due to different chemicals reacting on the surface. Mirrors are made by applying a thin layer of silver nitrate onto the glass, which blocks light from passing through and allows the reflection to take place. Protective coatings are then added to the mirror to protect it from damage. When the protective coatings are compromised, the silver nitrate is revealed. This chemical reaction to the elements in your home is known as mirror rot or desilvering.

Most often, bathroom mirrors are the most affected by mirror rot. Contaminants in the air attack the silver backing of your bathroom mirror, which causes discoloration and flaking. Soapy water or incorrect cleaning liquids are prone to accumulate on the edges of the mirror and will erode the backing. The discoloration that occurs from this chemical reaction is what leads to the edges of mirrors turning black and can take away from the beauty of having mirrors in your home.

How to Avoid Black Edges on Your Mirror

At Glass Depots, we apply additional protection to mirrors that we supply and install to keep them beautiful and free of black edges. We know that mirrors are an investment in the design of your home, so we are committed to helping you maintain them. Glass Depots will work with you to find the best solution to the problem and will ensure your mirrors look beautiful for years to come.

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