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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Heelys Unisex Launch Little Kid Big Kid Adult Black Rainbow Metallic 6 M US
Heelys Unisex Launch Little Kid Big Kid Adult Black Rainbow Metallic 6 M US
$55.52
4 CARMAX Navy Blue Performance Polo Shirt Top Womens size Small Petite
4 CARMAX Navy Blue Performance Polo Shirt Top Womens size Small Petite
$35.75
LG INSULATED FAST FIT BLK
LG INSULATED FAST FIT BLK
$28.39
Mattress Topper Full Down Alternative DUO V HOME 2 Thick Overfilled Pillow
Mattress Topper Full Down Alternative DUO V HOME 2 Thick Overfilled Pillow
$66.32
Set of 4 Decorative Mini Artificial Succulents Plastic Synthetic Plants with
Set of 4 Decorative Mini Artificial Succulents Plastic Synthetic Plants with
$19.21
50 Pounds Rubber Crumb Synthetic Turf Material For Turf Fringe
50 Pounds Rubber Crumb Synthetic Turf Material For Turf Fringe
$29.99
New Womens Large Leather Handbag Purse Shoulder Hobo Bag Brown Fashion Tote
New Womens Large Leather Handbag Purse Shoulder Hobo Bag Brown Fashion Tote
$44.99
Fastfit Work Gloves Black X Large
Fastfit Work Gloves Black X Large
$14.39
Working Concepts 5020 Extreme Standing Medium Mat
Working Concepts 5020 Extreme Standing Medium Mat
$47.66

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