Experimenting with Mordants

pink clematis flowers, clematis leaves and Japanese maple leaves mordanted in alum/washing soda

Over the last eighteen months while I have been experimenting with eco-dyeing, I adopted certain habits that usually work well for me. I like a routine that I can follow without having to think too hard about the steps I’m taking. My process has become natural and easy for me to quickly set up. I mix up a mordant of alum and washing soda in water, soak my plants in vinegar water and dip them in iron water before steaming them on the stove for an hour. I can be fairly certain of what the results will be with one plant or another. However, trying something new always leads to discovery, so I try to mix it up.

I’ve read a certain amount about mordanting in soya milk. This has always seemed like more trouble than it was worth to me, until I read that soya mordant generally makes the color of the plants brighter, whereas the alum mordant brings out more detail. I decided to do a little experiment to see if I could detect a difference between the two methods.

I used the same paper and plants for both techniques (pansies of two colors and a Japanese maple leaf). I dipped the plants in vinegar and iron waters as usual and steamed them together in the same bundle for exactly the same amount of time. The results were striking.

The alum mordant created a nice ghost image of the purple pansy and a very nice outline of the leaf. I like the pink color very much. The orange pansy is less detailed, but the color is distinctive.

The soya mordant certainly did give richer color and some reasonable detail as well, however the color is not absorbed into the paper since the soya leaves a slick surface. I got that marbling effect, which I describe as the color swimming on the surface. I don’t necessarily like it less or better.

The fun of eco-dyeing is, of course, that you never come to the end of experimentation!

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