The colour of the cross's pillar is achieved by the oxidisation of the copper, impregnated in resin and then bead-blasted to bring the copper to the surface.

BBC: Saltash Celtic cross marks Cornwall boundary

Bellini's profile portrait of Mehmet sniffing a rose is a masterpiece of cross-cultural exchange: Mehmet appears as a civilised ruler rather than a threat, yet in its colour and composition this portrait is unmistakably the handiwork of a Venetian master, testament to the city's artistic pre-eminence.

ECONOMIST: Venice and the East