How to Paint a Glass Window With Epsom Salt So You Can't See Inside

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Epsom salts crystallizing on a window resemble ice crystals.
Image Credit: CaryllN/iStock/Getty Images

Epsom salt -- the same substance used to create a soak for sore feet -- helps you turn any window into a "frosted" window overnight, simply by brushing the glass with a super-saturated Epsom salt solution. The faux ice crystals last for up to three weeks even in warm weather, and they can be wiped away with ease.

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Basic Recipe

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A simple, kid-friendly frosted-window paint begins with 1/2 cup of warm water in a clear glass container such as a measuring cup. Stir in 1/3 cup of Epsom salt, mixing until the salt no longer dissolves, to create a super-saturated solution. Mix in a drop or two of liquid dish soap. Epsom salt, also known as magnesium sulfate, forms crystals when the water it is mixed until it dissolves.

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Beer-Based Recipe

Another recipe for Epsom-salt frosted windows uses beer instead of water. Mix 4 heaping tablespoons of Epsom salt into a cup of a light-colored beer in a mixing bowl. The mixture will foam up quite a bit, so allow it to sit for 30 minutes or so until it stops foaming. Keep this version away from young children who may be tempted to taste it: Epsom salt is a laxative, and beer contains alcohol, so the combination, if ingested, may not be much fun for you or the kids

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Applying the Solution

To create a frosted-window effect, dip a microfiber cloth or terrycloth into either type of Epsom salt solution. Wipe down the window pane with the solution; then dab a dry paper towel over the wet window glass to absorb excess moisture. Allow the solution to dry completely, which may take at least a few hours. As the liquid evaporates, the magnesium sulfate reverts to a crystalline form that resembles ice crystals on the window.

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Simple Cleanup

Once you're ready to see through the windows again, wipe the windows down with your favorite window cleaner, such as equal parts vinegar and water. Use a lint-free cloth to clean the windows.

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