Siamese

Colors: Seal Point and Russian Blue. 
Chocolate Point is under consideration

Genotype: 
- Seal Point: aac(h)c(h)
- 
Russian Blue Point: aaddc(h)c(h)
For black eyed variants, 
one black eye (BE) gene is included.

Siamese is an acromelanistic mutation. This is a temperature-dependent pigmentation pattern where the body is light and the extremities are dark. Cooler temperatures make points darker, while warmer temperatures make points lighter.
Siamese rats should ideally be Black and Russian Blue based. Eyes may be ruby or black. Siamese rats should be unmarked and devoid of white and silvering.

Seal Point- 
 Body color is a warm beige with gradual dark sepia shading over the saddle and hindquarters of the rat with the base of the tail being the darkest. The points on a Seal Point are to be a rich dark sepia and should be well defined on the muzzle, ears, tail, tail root, and feet with the color carried well up the legs. Nails and pads should be dark as well. The points should blend evenly into the body color. There should be no 
blotches, patches, or streaks of color.

Russian Blue Point –
 Body color is a cool ivory with gradual gray shading over the saddle and hindquarters of the rat with the base of the tail being the darkest. The points on a Russian Blue Point are to be dark gray-blue and should be well defined on the muzzle, ears, tail, tail root, and feet with the color carried well up the legs. Nails and pads should be dark as well. The points should blend evenly into the body color. There should be no blotches, patches, or streaks of color.

Chocolate Point – (Still under consideration)
 Body color is a pale beige with gradual dark chocolate shading over the saddle and hindquarters of the rat with the base of the tail being the darkest. The points on a Chocolate Point are to be a dark chocolate and should be well defined on the muzzle, ears, tail, tail root, and feet with the color carried well up the legs. Nails and pads should be dark as well. The points should blend evenly into the body color. There should be no blotches, patches, or streaks of color

No other dilutes or markings are allowed.
Faults: WIP
Disqualification: WIP


History:
The first known Siamese rats were originally seen in French laboratory stock in 1978. Like most laboratory rats, they were initially hooded. They were then introduced into the UK fancy when members of the NFRS imported them from France. In the early 1980s, the Siamese were imported into the US by AFRMA breeders and fanciers. This was the earliest known import of Siamese documented in the US Fancy.

President's Notes:
The unique trait of Siamese is the contrast between the dark points and the light body color. This standard was written to reflect the ideal Siamese and to exemplify the Siamese specific traits that set it apart from other varieties.
Also keep in mind dilutes, recessive carriers, markings, and coat type do influence phenotypic expression of Siamese. They often times lighten siamese color and shading. 
I strongly believe some varieties should not be crossed and should aim to be kept pure within acceptable colors for these very reasons.
For example, if we wish to illustrate the richness in color & points, Siamese rats should ideally be kept and bred within the approved standard colors, which does include both siamese and non siamese(unmarked Black and Russian Blue).
I personally see little purpose in breeding Siamese as marked or diluted animals. For example, a blaze or a pearl. That is just going to weaken and/or hide the points and shading even more. The purpose of a Siamese is to see those points and shading! I cannot emphasize that enough.
There is no point figuratively and literally in a really diluted or high marked Siamese. Is it not the purpose of working with them to improve them? That is not going to happen if we mix all sorts of genes into Siamese
This is something I personally practice myself. And the the results speak for themselves.

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COLOR 
Agouti  
American blue agouti
Beige 
Black 
Blue
Buff 
Cinnamon
Champagne
Chocolate 
Chocolate agouti
Chocolate dove
Cocoa 
Coffee
Fawn
Mink
Pearl  
Platinum
Platinum agouti
Russian blue 
Russian blue agouti 
Russian cinnamon
Russian dove
Russian silver 
Russian silver agouti 
Silver Fawn  
UK Mink 
UK Lilac
Umber (Aussie Mink/brown) 

COLOR - C LOCUS 
Albino/Ivory 
Burmese 
Golden/Cream
Himalayan
Marten /Agouti Marten
Siamese Sable
Siamese

COLOR - MODIFIERS 
Marble 
Merle

FADING GENES 
Chinchilla 
Essex 
Frost 
Roan 
Variety-Breed Colors

COAT 
Bristle 
Hairless 
Harley 
Rex
Satin 
Silvermane
Standard
Velveteen 

MARKINGS
Bareback  
Berkshire
BEW (Black Eyed White)   
Blazed 
Capped
Dalmatian 
Dominant white spotting 
Downunder 
English Irish  
Irish 
Hooded
Masked 
Variegated
Odd-Eye 

BODY
Dwarf    
Dumbo 
Standard Ear
Manx