The verb incarnadine literally means "to make the color of flesh," although it's more commonly used to mean "to redden."
The first use of incarnadine as a verb is in Shakespeare's Macbeth, when Macbeth talks about the blood on his hands in Act 2, Scene 2. He says, "Will all great Neptune’s ocean wash this blood clean from my hand? No, this my hand will rather the multitudinous seas incarnadine, making the green one red." Macbeth means that there is not enough water in the sea to cleanse his hands, but instead the blood on them will stain the ocean red.