Vitrolite

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Black Vitrolite panelling on the Daily Express building in Fleet Street, London
Black Vitrolite panelling on the Daily Express building in Fleet Street, London

Vitrolite was an opaque pigmented glass available in different colors that was used for tiles in buildings from the 1920s to the 1950s. It was also used to cover the station walls on the TTC's original Yonge subway line, opened in 1954. They have all since been replaced, except at Eglinton station. Vitrolite is no longer made.

Vitrolite tiling at Eglinton station in Toronto.
Vitrolite tiling at Eglinton station in Toronto.