It was interesting to read that one of the dyes used most frequently by Ethel Mairet was bracken (Pteridium aquilinum). In my garden I have several bracken or common fern plants which need to be cut back, so I decided to experiment with them.
I started with the old pruned leaves (see photo below) and was pleased with the results, especially from the alkali (washing soda) modifier.
Below are the results from this dye bath. From the top: no modifier, washing soda modifier, iron modifier, exhaust dye bath no modifier (All 10% alum mordant on wool)
For comparison, I decided to also make a dye bath from the new fiddle-heads (see photo below.)
Below are the results which rather surprised me, as I had been expecting the colours from the fiddle heads to be more yellow in tone.
From the left: alum mordant, alum + washing soda modifier, alum + iron modifier
I then decided to try a cool dye bath with the old leaves. I left the samples to steep in the dye liquid for about 12 hours and this cold soak produced the colours shown below.
Upper skein: no modifier, lower skein: washing soda modifier (Both alum mordant)
I then re-simmered the old leaves, strained off the dye liquid and added more skeins, this time unmordanted. The results are below.
From the left: no modifier, washing soda modifier, no modifier but skein simmered in the dye bath for a longer period of time.
Although the skeins are browner in tone than the photo suggests, these results were quite surprising, as I hadn’t expected to get deeper colours from the re-simmered leaves.
These experiments gave some interesting shades and I am not surprised that bracken was a dyestuff frequently used by Ethel Mairet.