Hannah obtained Gingerbits in November 2018, and the shelter he came had tried to wash him because they thought the blue areas were due to grime. In July 2019, Hannah in the USA sent my photos of her 2-year-old cat, Gingerbits – GB for short, who has a very prominent red-on-blue/blue-ginger tabby pattern. Because the bluish hue is retricted to the extremities (points) it may be affected by temperature, as those regions are cooler than the cat's torso. In red or cream cats (the red/cream colour is due to phaeomelanin) the bluish effect may be due to such genes causing some eumelanin to be expressed. In silver cats, there is sometimes a golden "tarnish" on the muzzle. In black/brown tabby cats, polygenes are known to affect the background colour, sometimes warming (brightening) it and sometimes "cooling" it. Tosca, a solid red female shows really clear bluish hues while the red-and-white bicolour housecat shows the blue tailtip really well and the lighter part of his tabby pattern also looks a bit grey.
In many cases, kittens with bluish extremities turned fully red as they grew older, but some adult cats still retain the blue/grey hue.
Marjan Boonen, a breeder in The Netherlands, has noticed that red cats sometimes have a bluish hue on their extremities: tail, feet, muzzles and ears. (photos copyright of individual photographers)Ĭolours can be modified by numerous genes (known as polygenes) which creates warmer or cooler tones. RED-ON-BLUE TABBIES, PSEUDO-CINNAMON & PHOENIX COLOUR
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