little did i know, but most modern chalkboards are made of steel:
The highest grade chalkboards are made of a rougher version porcelain enameled steel (black, green, blue or sometimes other colours). Porcelain is very hard wearing and chalkboards made of porcelain usually last 10-20 years in intensive use.
and what about chalkboards evil nemesis, the whiteboard:
The white background can cause contrast problems for people with vision impairment.
i guess thats settled.
additional info here.
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