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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Beckham Hotel Collection 1200 Series Lightweight Luxury Goose Down
Beckham Hotel Collection 1200 Series Lightweight Luxury Goose Down
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Mattress Topper Full Down Alternative DUO V HOME 2 Thick Overfilled Pillow
Mattress Topper Full Down Alternative DUO V HOME 2 Thick Overfilled Pillow
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Set of 4 Decorative Mini Artificial Succulents Plastic Synthetic Plants with
Set of 4 Decorative Mini Artificial Succulents Plastic Synthetic Plants with
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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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New Womens Large Leather Handbag Purse Shoulder Hobo Bag Brown Fashion Tote
New Womens Large Leather Handbag Purse Shoulder Hobo Bag Brown Fashion Tote
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Fastfit Work Gloves Black X Large
Fastfit Work Gloves Black X Large
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Fastfit Work Gloves Black Medium
Fastfit Work Gloves Black Medium
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Biohazard Fluid Clean Up Kit 7 Pieces Synthetic Fabric Bag
Biohazard Fluid Clean Up Kit 7 Pieces Synthetic Fabric Bag
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SockGuy Mens Crash Test Dummy Socks Orange Sock Size10 13 Shoe Size 6 12
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Sleep Restoration Down Alternative Comforter 1400 Series King California King
Sleep Restoration Down Alternative Comforter 1400 Series King California King
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