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The results won't be so intense. With the red dyeing last week I put in scraps of different fibers: right is merino wool, left is cotton/linen. You clearly see the difference.

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But perhaps there are colours for cotton available? Her you get a powdered stuff that is meant for dyeing in the washing machine. We used it a lot clothing when the black had changed to grey or for making curtains out of old bed linens.

Search the internet for videos or blog posts in your language - there probably is something, you just have to try what words to use in the search :)

Okey, thank you much for the suggestion...