I have lusted for India Flint's book, "Eco Colour" for a while, and I finally purchased it.
What a wonderful book - so full of interesting ideas for getting color from plants.
Her focus is on using non-toxic mordants and the heat of the sun to transfer color from plants onto fabric.
India Flint is from Australia, so much of her work is done with Eucalyptus - which is not growing here in Montana. I have been researching native plants, and have begun my own research. Above, I am working with yarrow. Below, is burdock and mint.
For Solar Dyeing, I have soaked silk and cotton fabrics in either alum or vinegar, then they are rolled up with plant materials into a tight bundle.
I have stuffed the bundles into glass jars or plastic containers and put them out in the sun. Each is labeled with a date and the ingredients.