Early this summer I found a method to 'dye' with rust. Essentially I soaked the yarn in a strong vinegar and water solution (50/50?), then wrapped the yarn around something rusty, I used the blade of our old mattock. Then I sealed it with glad wrap and left it outside for nearly a week. It was in the sun most afternoons but it also rained.
The fibre was a soft Tasmanian merino but now it feels a lot harder - evena a little brittle. When iron is used as a mordant they say this can happen, so I'm not really surprised. The colour is quite soft and pleasant, but it doesn't have that saturated dyed look, rather more like it is adherring to the surface of the fibre.

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