I folded wire wool into small pieces of damp silk, I am working on a small scale as making puppet clothes.
I left the silk for a few days in a zip lock bag until I could see rusty patterns.
This was interesting but with too much contrast and still didn't look very old so I soaked the samples in tea and got a fantastic new blue grey colour appear, some chemical reaction happened I'm sure.
I am really delighted with the results! Now think I need to go on another of her courses and learn to dye properly and more of her fabulous techniques.