Goldenrod in March 2009
I had cleared perhaps a dozen plants about a foot high so I chopped them up very roughly covered with water and heated very slowly and gently for about 12hours. The water was a deep brown to my surprise so I drained off the dye bath and repeated the extraction.
Into the resulting dye bath I put my ubiquitous Teeswater fleece and a 100 g of 18.5micon merino tops which has been in a very weak indigo vat and was dyed a very pale blue with lots of white areas. Both had been mordanted in 8 % alum 7% Cream of tartar.
The Teeswater took the colour first turning a soft pinky purple while the merino looked a rather unpromising grey. After 6 hours or so the merino began to look a greyish purple. Gingerly I added a drop of ammonia to see whether it would brighten the colours and the whole bath went a deep green. This change is rather reminiscent of the colour from elderberries which change from purple to green (and back again) with a pH change.
The resulting colour has proved very difficult to photograph looking blue or grey or even purple against different background.