It is only in modern times carrots that are orange. Previously, carrots came in other colours. This blend has a little of each colour that carrots come in, aside from orange.
If you spin your singles fine, the colours will blend so that you do not see a large distinction between the colours. If you spin your singles larger, you will see pops of each of the different colours.
Note: Although we try our best to accurately represent the colours in our photos, differences in monitors could mean that the colour you see on your screen is different from the fibre colour.