Cinnamon in the UK is one of our older rat varieties, and they tend to be really robust and pleasant variety to breed.
The standard states that cinnamons should have chocolate ticking, but the bands and guard hairs are paler than chocolate as the variety is based on the mink gene rather than chocolate. This means that it’s not unusual for cinnamons to be too pale and bright, especially if you introduce other genes such as red eye dilute.
Cinnamon based on American mink tends to be a different shade, and can have ruby eyes.
Genetics: Agouti with the mink gene (A-mm)
NFRS standard: To be a warm russet brown, evenly ticked with chocolate guard hairs. Base fur mid-grey. Belly fur as Agouti but of a lighter shade. Foot colour to match top. Eyes black.