Q: What navel orange has flesh consistently the colour of a ruby grapefruit? The growers said that they were Washingtons, and the colour was due to their organic growing methods.
A: Valencias with colour are blood oranges but need the cold to achieve their colour. When grown in the tropics oranges can have very little colour, even be green skinned yet ripe, so maybe these navels are grown in a cold area to achieve their red colour.
The Cara Cara strain of navel orange has consistent ruby flesh. It is sold as ruby red navels.