Before you comment that I should be using tannins if I want the colors to last in the sun, please check out my newest video:
Mordanting Cotton With vs Without Tannin    • Mordanting Cotton With vs Without Tannin  

In this video I use 6 mordanting methods on cotton fabric and then dye the fabric pieces with 4 natural dyes. You will see the mordanting process and the results. I also performed a light/wash fastness test on the dyed fabrics to see how the colors last.

Blog post with photos of the results and descriptions of all mordanting methods: https://www.chromaticnatureclothing.c...

Mordant ingredients I used:
Aluminum Acetate https://www.chromaticnatureclothing.c...
Aluminum Lactate https://www.chromaticnatureclothing.c...
Alum (Potassium Aluminum Sulfate) https://chromaticnatureclothing.com/p...
Sodium Acetate https://chromaticnatureclothing.com/p...
Soda Ash https://www.chromaticnatureclothing.c...
Calcium Carbonate (chalk) https://www.chromaticnatureclothing.c...
Soy milk & vinegar grocery store

Synthrapol detergent https://www.misterart.com/crafts/text...

The dyes I used:
Madder root https://www.chromaticnatureclothing.c...
Osage Orange https://www.etsy.com/listing/62246447...
Avocado skins eat some avocados
Logwood https://chromaticnatureclothing.com/p...

00:00 What this is about
01:45 Soy milk mordant method
04:03 All the other mordant methods
10:44 Dyeing the fabrics
12:56 Light/wash fastness test
14:01 Soy milk debacle
15:07 Madder root results
19:22 Osage Orange results
21:46 Avocado skins results
24:14 Logwood results
26:31 My closing thoughts