Here is the result of the lightfastness test with my homemade black walnut ink. I’m pretty happy with the results. The ink that was exposed to sunlight shows some fading, but it’s not severe. There probably aren’t conditions much harsher, light-exposure-wise, than a car dashboard. I don’t know technical terms or categories, but I’d call this ink pretty lightfast.
Winter was a good period for this test, because it was cold and my windows were rolled up. I couldn’t conduct this test in the summer because the paper would blow around.
Alternate testing method: painting your Festiva walnut brown for the winter.
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