What colours could River and Star produce?
Star carries black and silver, it is unknown if she carries chestnut
River carries black, chestnut, silver and cream
Neither carry bay
This means that the following colours could result from this service:
Black, unknown for Chestnut
Smokey Black, unknown for Palomino
Silver dapple, unknown for Silver chestnut
silver smokey black, unknown for Silver Palomino