The bones in my cooked chicken are dark gray or black — is that dangerous?
The dark coloration in chicken bones is primarily due to the presence of bone marrow, which can appear darker when exposed to heat during cooking. This is especially common in younger birds whose bones are more porous, allowing marrow to seep through more easily. The discoloration is not an indication of spoilage or disease but rather a natural occurrence in the bone structure.
In young chickens, the bones have not fully ossified, meaning they are still in a transitional phase between cartilage and bone. This porosity allows blood to seep into the bone, and when cooked, the iron in the blood oxidizes, causing the color change. This is purely a cosmetic issue and does not affect the safety or taste of the meat.

2. The Science of Bone Marrow Pigment Reactions Explained Simply
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