Crystal Frost Window Paint

Homemade Crystal Frost for your Windows

You can "frost" a window with Epsom salt crystals, even when it's hot outside.
You can "frost" a window with Epsom salt crystals, even when it's hot outside. Anne Helmenstine

Grow non-toxic crystals on your window that look like frost. These easy crystals grow in a few minutes and give you the effect of frost, even if it's warm!

Crystal Frost Materials

You only need a few common household materials for this project:

Prepare the Crystal Frost Paint

  1. Dissolve the Epsom salt in the hot water.
  2. If the salt doesn't completely dissolve, microwave the solution for about 30 seconds.
  3. Add a few drops of liquid dishwashing detergent. The detergent helps make the crystals easy to wipe away when you're done with them.
  4. Use a paper towel or rag to wipe a window with the solution. Crystals will form in a matter of minutes.
Magnesium sulfate crystals
Epsom salt or magnesium sulfate crystals often form delicate needle shapes.  Stefan Mokrzecki / Getty Images

Helpful Tips and Tricks

  • Make certain the Epsom salt is dissolved. If there are salt grains in the solution then the window will have uniform crystals rather than random-looking "frost".
  • Use your finger to "write" on the window. The invisible text will act as a center for crystal growth, producing an interesting effect.
  • Other smooth surfaces work well. Try a mirror, a metal pan or a translucent plate.
  • When you're done with the frosted window, you can wipe it away with a damp cloth.

View a video of this project, including time-lapse photography of crystal growth.