The columns were probably fluted when the construction had been finished. It is because that if fluted previously, they were damaged by the blocks for the wall.

The column was fluted in some degrees. At first, the knobs to lift was removed and the surface was smoothed. Then it was fluted roughly and smoothed carefully. In this stage, the surface of the base and the wall was also finished.

We have an idea that the Greek temples were fine white. However, they were painted in many ways. Although the most of the paint on stone were faded, terracotta can preserve vivid colours. Careful investigations for the surface sometimes reveal the evidence of the colouring. Also the columns were varnished for the protection.

  Susan Woodford, "The Parthenon" (1981)
J. J. Coulton, "Ancient Greek Architects at Work" (1982)
John McK Camp, "Ancient Athenian Building Methods" (1984)