A Mystery
It started with a simultaneous Instagram-post-exchange. My friend and I often like the same things and we sent the above post to each other with a question, "How did she do this.?"
Eco-dyeing is very close to my wheelhouse and this post opened my eyes to using bark in the winter. If I could get it to work, it would bridge the winter gap.
There were two possible candidates to consider: Eucalyptus and Mulberry bark. My friend instantly found Eucalyptus Bark in ETSY and I found Mulberry Bark at Hiromi. Again, simultaneous actions without much communication between us.
Mulberry Bark (Hiromi)
Eucalyptus Bark (ETSY)
My Eco-dye method involves the tannin inside of plants reacting with the iron embedded in the mordanted fabric. I checked and discovered the following:
Mulberry bark (Morus spp.)
Eucalyptus bark (Eucalyptus spp.)
This would assume that the bark from the Eucalyptus tree, higher in tannin, will have a stronger print. Below is a summary of several experiments on a simple cotton piece of RK Kona cotton.
My preferred mordant is lighter in iron and I used it for the first experiments. Later I mordanted a piece of cotton with a high level of iron and found a dramatic difference (see below).
Eco-dyeing is all about trial and error based on about a dozen variables. For more information on eco-dyeing check out Irit Dulman's teaching videos. https://iritdulman.com/workshop/
I started with Eucalyptus Bark, soaked it overnight and found it to be flexible, flat and a bit slimy. This was a great candidate for Eco-dyeing as it could be tightly rolled over a pipe without a problem.
The mulberry bark resulted a very light print with a difference between the core of the bark and the outside. The left side of the above pic is the inside of the bark and the mirror image of (outside bark) is on the right.
Here, I continue to re-steam the same fabric after re-positioning locations of freshly soaked mulberry. For a cotton print, the result was quite beautiful with more depth to the print.
After discovering that Mulberry was lower in tannin with a very light print, I soaked the Mulberry bark in a solution of tannin overnight.
Once my friend dropped off the eucalyptus bark, I started the same
experiments using large, hard and tough bark. Shaving off parts of the
bark made it manageable.
Above you will see the RK Kona Cotton experiments using my standard lower iron mordant (left) to the higher iron mordant on the right. Notice the high iron mordant (right) has a stronger orange color, typical of the higher iron content.
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The above pic shows the bottom layer of the darker Eucalyptus bark next to
the yellow print of Mulberry. The above prints were from Mulberry soaked
in tannin. Since the fabric is folded in half, you can compare of
prints from the outside of the bark to the inside.
Above is the higher iron mordant with the characteristic orange color. Eucalyptus bark gives a huge dramatic effect and mulberry soaked in tannin also showed much more drama.
I purchased more eucalyptus bark (ETSY) that was smaller in size and thickness.
Above is a double print showing a mixed bag of different bark samples and other plants that are dried for winter use. I blended both mordants (high and low) and found an in-between print.
Mystery Solved: It was fun to demonstrate the difference in tannin and iron levels. Someday I might go back and get serious about replicating the Insta post. For now, I've found a new tool. We are surrounded by a woods with plenty of bark that I can now soak in tannin and print on fabric in the winter.
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