Historically, they were called blackboards, and then sometime in the mid-20th century, they became green, and thus chalkboards. Now, you can turn anything chalkable, but are mostly limited to the original black.
Until now.
“The Craft at Home blog has a recipe that makes any acrylic paint of your preference chalk-friendly, though darker colors are still more effective as an actual writing surface. That recipe requires powdered tile grout and glazing medium, which you can usually find at your local hardware store.”
Follow this link for a complete how-to.
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