Surprise! It worked!

Here is the full repeat before simmering:

Here is the repeat after 30 minutes simmering in plain water. If the colors ever fade, all I need to do is re-simmer!

Back in the 70s, Sally Fox read about the many colors of naturally colored cotton grown in South America and worked hard to rediscover these through experiments in early selective growing. She sells them through Vreisis, and others have followed her path. So far, she still hasn't found the true red and true lavender mentioned in ancient records. Still, amazing!