Eye black. The colour should be rich, deep and sparkling with no sootiness.
You want to join? Awesome!
Before you join, please note that the NMC is a club for those who are interested in breeding and showing exhibition mice, and when you join you will be bound by the rules and aims of the club. If your interest is in keeping mice as pets, this club will not be suitable for you.
Please also bear in mind that the National Mouse Club does not support those who sell pet mice on line, and reference to membership should not be used when advertising such mice for sale.