the day my parents visited & brought me the hollyhocks (see previous post), they also brought me blackberries (growing wild, of course) (rubus fruticosus). They had frozen these as well, in order to keep them at their best.
I had mordanted (with alum) enough fibers for two different dyes. But I thought " what the heck, let's make an experiment inside the experiment, and you'll rince half soon, and the other half later". And that's exactly what I did.
I rinced a first half the same day I rinced the alcea rosea solar dyeing, which is to say, after four days in the jar only. So this is the result of the first batch.
interesting, right ? worth the little experiment, for sure.