Tans and pastels are one in the same. Pastel is simply used to describe a light tan (similar in colour to a homo beige) The difference between beiges and tans is that tans have the ebony gene. This means that they do not have the white belly that the beige would. Tans are also often influenced by the red tint that affects the beiges and the ebonies. Tans will range from the very light pastels to the very dark chocolates. Tans also exist in the homozygous state for the beige gene. Tans can also be found with the TOV gene.