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I can only think of one off the top of my head.

That's red cabbage leaves, they make a blue-purple colour.

I also depends on what you are colouring.

Red cabbage leaves are best for clothing, especially silk or any loose-woven fabric.

Hope this helps.

:)

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Q: WHAT IS A natural blue dye?
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Related questions

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Indigo is a deep blue purple color. It is also the name of a dye that is derived from the indigo plant.


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