Synthetic Material

What is the material old-fashioned school chalkboards are made from?

What is the green or black material called which make up older chalkboards in school? I assume it's some kind of synthetic material.

Porcelain-enamelled steel. In other words, they are a combination of ceramics and metal.

At first, I was going to say slate, as this was the original natural stone material that early chalkboards were made of, but then realized that "old fashioned" didn't mean THAT old-fashioned.

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Charter Club Open Toe Memory Foam Scuff Slippers Taupe XL US 11 12
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Character Club Ballet Slippers Petal Pink Medium
Character Club Ballet Slippers Petal Pink Medium
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PA0059 GORE ONE UP PUMP DIAPHRAM FOR YAMADA BRAND PUMP PART YA0059 B82
PA0059 GORE ONE UP PUMP DIAPHRAM FOR YAMADA BRAND PUMP PART YA0059 B82
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50 Pounds Rubber Crumb Synthetic Turf Material For Turf Fringe
50 Pounds Rubber Crumb Synthetic Turf Material For Turf Fringe
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