I had high hopes for this dye bath, as I had read that purple loosestrife, in an iron pot, produced a lovely near black. Not so, at least not the way I did it. I used my usual alum mordant with a bit of cream of tartar for an hour or so (cool water), then put it into a cool purple loosestrife tea and raised the temperature to a simmer. It cooked for well over an hour, and then sat for almost 24 hourse. What I have is grey, and I’m not sure how much may yet rinse away.
After I had put the wool into the dye bath, I started browsing one of my dyeing books and discovered that the mordant may work better if I leave it for at least 24 hours before dyeing. That will be something to try nixt time.
I am seriously considering a project where I try various ways of treating ditch weeds. This leads to all kinds of interesting questions: would the average Merovingian housewife have dyed her own textiles? If she did, what mordants did she have access to? What dyes would she have used? Luckily for me, purple loosestrife is native to northern Scotland, so my nasty grey wool need never see the light of day (unless I find a way to combine it with something more attractive).