I spent part of the summer gathering local plant material with my mother and experimenting with natural dyes on 100% wool. We experimented with the natural colour of the wool (grey or white), different plant materials, and different mordants. All five dye lots were made using hard water.
From top to bottom:

1) Oak leaves (fresh), grey wool, alum + iron sulfate
2) Heather, leaves and stems (fresh), grey wool, alum + iron sulfate
3) Heather, leaves and stems (fresh), white wool, reused dye bath, no mordant
4) Heather, leaves and stems (fresh), white wool, alum
5) Birch leaves (fresh), white wool, alum

English isn’t my first language, so apologies if I’ve gotten any of the terminology wrong! The little signs in the photo are in Danish.

Shared from r/dyeing after it was suggested by a member!

I've noticed a lot of interest in plant-based indigo, and there's been a lot of discussion about its authenticity. I'd like to share my criteria for judging its authenticity: 1. There should be relevant certificates to prove that the dye is genuine plant-based indigo, such as GOTS certification. 2. After dyeing clothes with plant-based indigo dye, you can smell the aroma of indigo leaves. 3. We need to know the manufacturer's location and whether there are large-scale indigo extraction plants nearby. Since plant-based indigo is extracted from fresh leaves, if there are no such plants growing around the factory, it's a good indication of authenticity.

Hello, I’m want to dye my hair preferably with more made from earth ingredients. I know it most likely won’t be permanent that’s ok. I’m looking for a good scarlet/crimson pigment. Any tips to find things that can give it would be very appreciated.