This is the creepiest thing I have ever researched. Can you dye cloth using blood? Will it work? Or would it go all tacky and smelly? (It's not human blood, in the story, if that's any better). What color would it be?
So far I've googled "dyeing cloth with blood" and "old dried bloodstains" and I've gotten a lot of cleaning tips and some articles about disasters at dye factories. I also googled "animal blood dye" and got tips on dyeing bone beads. Any ideas on google phrases?
As ever, thank you for your input!