Self - H/H
A self rat is one devoid of any white markings. The colour covers the rats entire body. Although, it is possibly for selfs to have very small white markings, such as tiny white spots on the belly, white toes and white feet. Agouti based rats have a lighter coloured underside in comparison to non-agouti based rats.
Berkshire - H/h
A Berkshire marked rat has a white stomach, white front paws and back feet, and in many cases will also have a white tail tip. The marking on the stomach can encompass all of the underside, like the one pictures left, or just be a few splodges, a large wonky streak, etc.
Irish - H/h
An Irish marked rat is one with a white triangle on it's chest between it's front legs. Be aware that Irish marked rats are Berkshires selected for the marking, another hypothesis is that the Berkshire rat also has modifiers which affect the distribution of white on the rats chest to appear as the above described marking.
Hooded - h/h
A hooded rat has a solid coloured head and shoulders, with a stripe running down it's back, known as the 'saddle'. Hooded rats do not always have a perfect line of colour extending from between the shoulders to the base of the tail, in many instances they have a few coloured markings along the spine that stop and start, some are incredibly minimal and only have a few markings down the back.
Bareback - h/h
A bareback rat is similar to a hooded marked rat in that the head and shoulder area are solidly coloured, however where the hooded rat has a 'saddle' of colour running down it's spine the bareback does not.
Capped - h/h
The capped marking is one that does not extend past the ears, and is characterised by a solid coloured head, with the rest of the body being white. Some clubs standardise capped as being colour that does not extend past the ears or lower jawline, favouring a rat with a white chin. The rat pictured left has an over-marked cap, in that it extends past his ear but does not cover his shoulders to place him as a bareback. The rat in the photo is what is also referred to as a 'split-capped', a capped rat with a head spot that trails and intersects the cap all the way to the shoulders, however split-capped rats are not standardised.
Variegated Berkshire - H/h V/*
Variegated Berkshires are Berkshires who also express the variegated gene (V*) or one copy of the white marking gene (Nn) or both. They are characterised by the white Berkshire stomach and feet, but also have white markings that come up the sides of the rat and appear 'freckled' or like salt and pepper. Be aware that a rat with a small blotch of white coming up it's side may in fact be an over-marked Berkshire.
Variegated - h/h V/*
A variegated rat is one with speckled markings along it's back, it is also referred to as 'variegated hooded' as the speckled marking only appears down the spine and does not extend very far down the sides.
Downunder - Du/*
Downunder is an interesting marking trait, the rat will have a large stripe running down it's underside like the one pictured left. The downunder trait has also been known to cause spotting in rats and false variegation. Downunder rats can be many markings, downunder Berkshire, downunder hooded, downunder spotted, downunder hooded spotted, downunder variegated, and even downunder variegated Berkshire.
A wedge blaze is a facial marking that appears as a triangular marking on the rats face. It can be caused by the wedge gene or on a rat that expresses one copy of the white marking gene, or both.
A head spot is a white mark usually located on the rats forehead, they can be round, a few hairs, a streak or an undefined blob.