For now I'm doing some simple experiments with a few of my favorite dyes to gauge how much time it takes each to fade and what the color change is. And I also learned how difficult it can be to match the dyes exactly - this will take a lot more experimentation...
|Dye Samples. From left to right: no mordant, alum, iron, copper.|
From Top to Bottom: Onion, Brazilwood, Turmeric, Blackberry.
|Turmeric with no mordant sample before fading experiment began|
|Turmeric with no mordant after one week of direct sunlight exposure|