05/16/2026
Have you ever hatched out a fibromelanistic chicken? Birds such as Svarthöna (what I hatched), Ayam Cemani, Silkies etc can leave behind these dark stringy veins.
Any breed can leave behind a dried out vascular membrane when they hatch, and while they usually dry to a dark burgundy colour, in fibro breeds they typically dry down a deep black.
Fibromelanistic chickens have a gene mutation that causes hyperpigmentation. That can mean black feathers, skin, beaks, combs, wattles, meat, organs, and even bones.
Picture of our last Svarthöna rooster, Batman as example