Magical gene / fields and regions

Patina

Copper going green - verdigris in the same places a mealy horse goes pale, arriving as speckled grains rather than as a wash, with mottling round the eyes and muzzle.

What it can come out as

Outcome	Carrying
Patina	`Pat/Pat` · `Pat/n`
Wild type	`n/n`

How each one is actually drawn - region by region, and the layers it is built from - is on the coding tab.

Crossing two of them

Finding one

About 1 in 1,250 wild horses is born showing this. That is the whole of the supply: catch one, or make one with the carrot below. Breeds set their own pools and a breed built around this gene will carry it far more often than the wild population does.

Wild pair	Shows as	How often
`Pat/Pat`	Patina	0.004% — 1 in 25,000
`Pat/n`	Patina	0.076% — 1 in 1,316
`n/n`	Wild type	99.92%

Its gene carrot

The file

common/src/main/resources/horsegenetics/genes/patina.json — a data-driven gene, not a Java class. It is listed in the index.json beside it and registered by Genes' class initialiser at startup.

Key	`horsegenetics.patina`
Phase	magical — it adds signed colour in phase 3, after the pigment has resolved
Priority	273 — where it sits in the one `(priority, key)` paint order
Alleles	`Pat` · `n`
Varies per horse	3 values drawn once off the expressing allele copy, so a foal that inherits the copy inherits the look
Built from	AXIS, PARTS, PIGMENT, SPECKLE, TOWARD

What it paints

Each outcome, described the way the gene file describes it, and then the layers that draw it in the order they are painted. The prose is the part a reader checks a bake against; the list underneath is what the engine actually did.

Patina

Oxidation, in the pattern copper takes - and in exactly the places a mealy horse goes pale, because those are the parts of a coat the sun and the sweat get at: the muzzle and jaw, the rings round the eyes, the belly and flank, behind the elbow, up the inside of the legs, and into the mane and tail. Where pangare's boundary is a soft fade this one is speckled all the way along it, so the green arrives as grains rather than as a wash. Dominant, so wherever it is present it shows, but how much varies enormously from horse to horse: a few faint traces on one, heavy verdigris marbling on the next. It also mottles the skin round the eyes and muzzle. A dark coat hides most of it, which is why it is often said not to exist on black horses; a diluted one shows it better, and a double cream or pearl coat hides it completely while passing it on intact.

verdigris up the belly, the flank and behind the elbow — AXIS × SPECKLE × PIGMENT inverted, painted with TOWARD
the muzzle, the jaw and the rings round the eyes — PARTS × AXIS × SPECKLE × PIGMENT inverted, painted with TOWARD
up the inside of the legs — AXIS × SPECKLE × PIGMENT inverted, painted with TOWARD
the mane and tail, where the oxide gets into the hair — PARTS × SPECKLE × PIGMENT inverted, painted with TOWARD
mottling round the eyes and muzzle — SPECKLE, painted with TOWARD

Wild type

No oxidation.

Paints nothing.