Siamese Colour Genetics Course · Lesson 5 of 8
Most genetics guides don’t mention caramel at all. It’s real, it’s GCCF-recognised, and it quietly confuses breeders who don’t know to look for it. Siamese caramel point genetics come down to one extra gene — the dilute modifier — and it only shows its hand on cats that are already dilute. I’ve judged caramels and apricots at GCCF shows, and I can tell you the confusion on the bench is real: a caramel is forever being written up as “an odd-looking blue.” This lesson makes sure you’re not the one making that mistake.
In Lesson 4 we diluted the base colours into blue, lilac and fawn. This lesson adds a modifier that shifts those dilutes one step further.
In this lesson
- What the dilute modifier (Dm) gene does — and why it only acts on dilute cats
- How blue, lilac and fawn shift to caramel, and cream shifts to apricot
- How to recognise the cooler, metallic caramel tone
- Why caramel is so often mistaken for blue
- How the gene passes down, including through dense-coated carriers
The dilute modifier — a gene that only acts on dilutes
Caramel comes from the dilute modifier, written Dm. It behaves differently from every gene we’ve met so far in one crucial way: it does nothing on its own. Dm only has a visible effect on a cat that is already dilute — that is, a cat that is dd at the D locus from Lesson 4. On a dense-coated cat (a seal, chocolate or cinnamon), Dm is completely invisible; the cat looks exactly as it would without it.
Dm is inherited as a dominant modifier, so a single copy is enough to shift the colour — provided the cat is dilute. Put simply: you need dilution plus the modifier for caramel to appear. Dilution without the modifier gives you an ordinary blue, lilac or fawn.
What the modifier does to each dilute
Applied to a dilute coat, Dm cools and “metallises” the colour, nudging it towards a brownish, greyed caramel:
- Blue + Dm → caramel (a cool, brownish-grey)
- Lilac + Dm → caramel (a slightly warmer, pinker caramel)
- Fawn + Dm → caramel (a lighter, warmer caramel)
- Cream + Dm → apricot (cream is dilute red — more on red in the next lesson)
So “caramel” isn’t a single fixed shade: it’s what you get when the modifier acts on any of the three dilute base colours, and the exact tone depends on which dilute you started from. Apricot is the same idea applied to cream. This is why the GCCF recognises caramel and apricot as their own colours — they’re visibly distinct from the plain dilutes, even though genetically they’re “a dilute, modified.”
How to recognise it — and why it’s mistaken for blue
The tell is a cooler, slightly metallic, brownish cast over what would otherwise be a clean dilute. A caramel from blue can look like “a blue that’s gone slightly wrong” — a touch browner, a touch greyer, a touch of a sheen. Because the shift is subtle and the starting colour is a dilute, caramels are routinely logged as blues (or lilacs) by people who aren’t expecting them. The safest confirmation is the pedigree: if there’s known caramel or a dilute modifier in the line, and the dilute in front of you looks “off,” you’re very likely looking at a caramel. When you’re judging or registering, the difference matters — they’re separate colours with separate breed-number classes.
How caramel passes down — including hidden carriers
This is where the modifier earns its reputation for confusing people. Because Dm is invisible on dense cats, a seal, chocolate or cinnamon can carry it silently and pass it on. That carrier only reveals itself when it produces a dilute kitten that also inherits the modifier — at which point a caramel appears in a litter where nobody was expecting one.
The practical rules:
- Caramel needs both ingredients in the same kitten: dilution (dd) and the modifier (Dm).
- A dense cat carrying Dm shows nothing but can pass caramel to a dilute mate’s kittens.
- A caramel cat is dilute and carries the modifier, so mated to dilute cats it can readily produce more caramels.
Why it’s rare
Caramel needs a lot to line up: a dilute cat (itself a recessive combination) that also carries the modifier. Two conditions stacked together, one of them invisible on the majority of cats that carry it, means caramels and apricots turn up only occasionally — which is exactly why they’re under-documented and so easily misfiled. If you breed dilutes and you know the modifier is in your lines, it’s worth flagging on your records: it saves the next person the confusion of a “blue that isn’t quite blue.”
Key takeaways
- Caramel comes from the dilute modifier (Dm), which only acts on cats that are already dilute (dd).
- Blue, lilac and fawn all shift towards caramel; cream shifts to apricot.
- The look is a cooler, metallic, brownish cast — which is why caramel is so often mistaken for blue.
- Dm is dominant but invisible on dense cats, so seals and chocolates can carry it silently.
- Caramel and apricot are GCCF-recognised colours in their own right — record them accurately.
In Lesson 6 we turn to the one gene that breaks all the rules we’ve built so far — the sex-linked orange gene behind red and tortie points, and why a male tortie is such a rarity.
See these colours in detail: caramel point and apricot point.
