If you want to try this you need:
150 g wool yarn (little skeins are best)
4 dl vinegar
4 dl water
a kettle full of water
8 tea bags (assam for instance)
This is my white yarn
First I soaked yarn in a mixture of vinegar and water for 20 minutes. While the yarn was in the water vinegar bowl I heated water with tea bags in a huge kettle. I did not let it boil but it needs to be almost boiling. Then I squeezed vinegar and water off from the yarn and put some of the yarn in to the tea kettle (some I put later for getting a lighter shade of orange). I turned heat off and put a lid on the kettle and left the yarn there for several hours. Then I washed the yarn and hung it to dry.
If you string the skeins tight enough you will have almost white stripes to those parts of the skeins. In my case I noticed this only when dyeing proces was finished but actually I love this kind of imperfection. There is a feel of handwork in those skeins.
This evening I am knitting with jumbo knitting needles and having tea and cinnamon buns because today is a cinnamon bun day (in Sweden but I think days like that are ment to be celebrated everywhere :)) . Fun and relaxing!