In the past the tower has gone from reddish brown to ochre-brown, yellow, brownish-yellow and dark red, before operators settled in 1968 on the current color.
Clouds bracket the edges of the scene, but the dark blue waters of the Atlantic Ocean show in the middle, and above them, a rippling, brownish-yellow river of ash.
Externally pale brownish-yellow or pale brown, with irregular, longitudinal wrinkles, cork easily exfoliated, exposing yellowish-white cortex, sometimes showing reticulated fibre bundles.
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