Last year, I saved around 40 avocado pits to dye one of my favorite white dresses pink that had gotten some random dark spots on it. The dress was too new to donate and just needed some new life breathed into it.
I placed the pits in a cheese cloth and then into a LARGE pot and boiled them until the water was very pink . I left the dress in the pot for around 4 hours (until it reached the desired pink hue I was going for) and then simply rinsed it with cold water and voila! It was like having a new dress.