So I found some white silk that I have bought at a tailor on sale and gave it a mordant (alun). The mordant water and the fabric was moved a lot. Then I made the colour water and after an hour of boiling it was ready for the fabric. I removed the onion shells and but in the fabric. The piece was about 1 m. The colour was on the fabric right away and during the next hour is stured all the time.
The result and the colour is amazing! It was much easier to dye on silk than I thought and I´m for sure going to make more silk during this summer.
This picture is taken in our livingroom and the light is not to good.
Here you can see the white silk and the plant dyed silk.