Eco-printing with Cochineal: A Spectacular Combination

Cochineal Dye
Eco-printing is a journey, more than a destination. It is a perfect project for the Infinitely Curious Person and a really frustrating project for The Perfectionist Person who wants standardized results every time. I’m the first one– the Infinitely Curious Person. It’s just that part of my curiosity involves wondering if I can standardize my results at least some of the time!

Some leaves print really reliably on fabric or paper, every single time. I can count on always getting some color from a Catalpa leaf, yellow, gold, green, or brown. Grape leaves? Nice, clear brown every single time. An oak leaf will always give me, at the very least, an outline of its shape or its silhouette in black.

Other leaves, like maple leaves, seem fickle. They only give up their color on Tuesdays, under a full moon, after an eclipse, if I chant old Beatles’ tunes while I lay the leaves out onto my fabric and then dance in circles while they steam. (Ok, I may have made that part up. I haven’t actually tried that series of actions, but I suspect they are necessary to get maple leaves to print every time.)

I’ve experimented, taken notes, used distilled water, steamed and not steeped, and tried to follow the instructions of successful eco-printers, yet still can’t always get a print from a maple leaf.

This week, I found a way to stack the deck in my favor. I know that “mordants” (from the French “mordre,” meaning “to bite”) will change the way natural fibers take natural dyes. But there are several other ways to influence the outcome of any type of natural dyeing besides the mordant.



For instance:

  • The type of fiber — especially if it is cellulose or protein based
  • If the fiber is thoroughly clean — “Scoured” fiber hasn’t even got soap still in it.
  • If the fiber has been pre-treated with an unknown chemical — Fabric softener, anyone?
  • If the fiber has been mordanted — Yeah, I forgot that just today. I wondered why those two silk scarves weren’t taking the dye like the others.
  • What type of mordant was used — You can completely change the color with your mordant!
  • If there was enough mordant for the amount of fiber — I admit, I’m not big on measuring.
  • What type of dye — Well, obviously, different plants (or bugs) give different colors. They don’t always come with labels on their box like the man-made dyes. Follow a good chart from a good source.
  • How much dye was used — A little cochineal goes a long way, but it takes a lot of onion skins to get a strong color.

How did I stack the deck with this latest batch of dyeing? I gave every single variety of leaf a whole bunch of different variables, assuming that every single variety of leaf would give me some reaction that would show up on my fabric. I was correct.


Here are the steps I took with this project:

  • I scoured the silk. I also scoured the linen/cotton blouse I found at the thrift store.
  • I mordanted the fabric with Aluminium Acetate
  • I dyed the fabrics with cochineal dye (Another blog for another day…)
  • I laid out the fabric and composed leaves on it. 
  • I tried to spread out ones that were known printers (like grapevine leaves) and ones that only sometimes behave for me (like the infamous maple.)
  • I dipped a strip of old blanket into an iron solution. (Old sheets work, wool fabric works… in this case, this was one of those old, fuzzy, probably-acrylic blankets we all stopped using when microfiber was invented.) The iron solution is also another blog for another day.
  • I layered the scarf, folded in half, into a sandwich of silk, leaves, iron blanket, leaves, then silk again. Here is a picture of it after unbundling. 
  • I found some old, heavyweight paper and put that on top of the sandwich. Again, you can see the paper in the picture. The string left marks on the paper, which can be a really cool intentional effect with this technique.
  • I used a section of copper pipe (for the convenience of it, not because it changes the dye in my experience.) I rolled the whole sandwich onto the pipe, as tightly and smoothly as I could. Ever roll a sleeping bag? Like that, only much smaller.
  • I bound the whole bundle with strong string. 
  • Then I steamed the bundle for 2 hours.
  • After steaming, I let the bundle cool, unroll it, wash it, and iron it dry.

What happened here? Some of the leaves dispersed the cochineal dye, some added color of their own, and some mixed their color. A few just took on the outline of the leaf, which is the magic of the iron blanket. Not a single leaf failed to leave some kind of impression on the fabric.


Even the maple leaves left a print, and they didn’t tell me if it was the pre-mordant, the dye, the iron blanket, or the fabric that made them decide to give me a print today.

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