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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Hotel Luxury 3pc Duvet Cover Set 1500 Thread Count Egyptian Quality Ultra Silky
Hotel Luxury 3pc Duvet Cover Set 1500 Thread Count Egyptian Quality Ultra Silky
$31.38
Charter Club Open Toe Memory Foam Scuff Slippers Taupe XL US 11 12
Charter Club Open Toe Memory Foam Scuff Slippers Taupe XL US 11 12
$11.29
Cotton Tale Designs Tula Front Crib Rail Cover Up Set
Cotton Tale Designs Tula Front Crib Rail Cover Up Set
$132.30
Highland Feather Manufacturing 180 Thread Count Richmond California Synthetic
Highland Feather Manufacturing 180 Thread Count Richmond California Synthetic
$130.62
Cotton tale designs 4 Piece Crib Bedding Set Lollipops and Roses
Cotton tale designs 4 Piece Crib Bedding Set Lollipops and Roses
$154.77
Lolli Living Bumper  Aztec Chevron  Crib Bumper With 100 Cotton Shell
Lolli Living Bumper Aztec Chevron Crib Bumper With 100 Cotton Shell
$65.90
GPS GSM GPRS Tracking SMS Real Time Mini Vehicle Motorcycle Bike Monitor FV88
GPS GSM GPRS Tracking SMS Real Time Mini Vehicle Motorcycle Bike Monitor FV88
$11.19
50 Pounds Rubber Crumb Synthetic Turf Material For Turf Fringe
50 Pounds Rubber Crumb Synthetic Turf Material For Turf Fringe
$29.99

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