How long does it take fingernails to turn black after you die?

Fingernails do not typically turn black after death; rather, they may appear darker due to changes in blood circulation and tissue decomposition. As the body begins to break down, the skin can change color, which may give the appearance of darkening around the nails. However, the actual nails themselves generally remain their original color unless affected by other factors, such as injury prior to death. Overall, visible changes can start within hours to days after death.