Question

Why post office red in color

Answer 1

Between 1866 and 1879 the hexagonal Penfold post boxbecame the standard design for pillar boxes and it was during this period that red was first adopted as the standard colour. The first boxes to be painted red were in London in July 1874, although it would be nearly 10 years before all the boxes had been repainted.

this was the hist. of the post office that why it uses the red colour....