Eco Printing on Cotton

Combine my stubborn streak with this mysterious art form of ‘Eco Printing’ and you have a whole lot of unique prints! I have been completely obsessed with this way of printing especially on cotton. Eco printing uses natures gifts in the form of leaves (and sometimes flowers) to create a transfer print to fabric without the use of ink or painting (so no drawing or painting skills needed). Come see this magic of Eco Printing on Cotton…

Preparing the Cotton Fabric:

As I had mentioned in my earlier post, each type of fibre needs to be readied for taking the colour from the leaves. To make sure you are starting with the cleanest possible fibres you should scour your fabric. Most fabrics have some coatings, starches and buildup of oils. Scouring is a strong cleaning to get of these impurities. Cotton should be scoured with a 2 hour simmer in a washing soda (soda ash) solution. Rinse out all the ‘dirty’ water once cooled enough to handle.

Cotton is fairly inexpensive so it seems a great fibre to start with. That is what I thought; however it turns out it is more difficult to print on cotton and other cellulose fibres (such as linen, rayon, hemp) than it is on protein fibers (such as wool & silk). With that said, preparing/scouring and pre-mordanting cotton is even more important.

The pre-mordant that can be used with cotton is soya milk. Multiple ‘soak and dry’ cycles help the fibre allow printing. Aluminum acetate (make at home using alum, washing soda & vinegar) is another possible pre-mordant however soya milk is readily available.

One of the printing mordants that I like to use is iron. I make a bucket full of rusty items and water to create a solution of iron. Vinegar can help you along to create an iron acetate. You may also buy iron sulphate and then use specific recipes for your iron solution. But the artist in me likes to be a bit more adventurous and leave some to chance, but it takes patience.

Oh the Mystery:

As a side note; this Eco dyeing art form is very satisfying when it all works, but it will not always happen. If you want perfect results each time, then find another print method. ‘Just as in life; things that are more difficult to get are usually worth more…’ That’s my theory and I accept the ‘duds’ as part of the process.

I have spent months learning and reading and testing and testing some more. But just like a degree in chemistry it is still no where near knowing it all. But that is also the beauty of this Eco printing; it keeps you yearning to learn more and trying new variations to make beautiful textiles.

I am a great observer. I had left a leaf in the iron water for a couple days and when I noticed it there was some great blue-black created by the iron and the tannins in the leaves. Ah-ha! A chemical reaction of sorts; so much fun!

Materials Needed:

  • Cotton Fabric (practice on ripped strips of cotton bed sheets)
  • strong string of some type (butchers twine is great)
  • scissors
  • some round type of dowel/pipe to wrap the fabric around (thicker is a bit better) (old wood curtain rods work well, copper pipe, piece of pvc pipe )
  • tray to soak leaves in
  • rags/towels (to soak up extra messes)
  • gloves
  • extra old sheeting (optional to make ‘Iron Blanket’)

Step #1 Prepare your leaves

Depending on the time of year, you may have fresh or dried/pressed leaves to dampen. I let them soak in the iron water for at least 30 minutes (enough time to get set up)

A long table is great, and placing some plastic or tarp to protect against stains (from iron)

In reference to the leaves, there are some that are more sure to print well. Maple leaves, japanese maple, rose, sumac, eucalyptus, smoke bush, black walnut, red maple leaves etc. have high tannin content. You will find your favourites. The weather, time of year, area, all play into the way that the leaf prints. The underside tends to print stronger as well.

Is your head spinning yet? That is why you need to take notes, for future reference.

Step #2 Place the leaves

These sheets were scoured in washing soda (not baking soda) well and no other treatment. (see further down for more pre-mordanted cotton methods)

The dipped leaves are placed so that there is a good coverage. Some are facing up and some down.

Step #3 Roll’em Up

Roll it up tightly to keep the iron-dipped leaves well flattened to the fabric. At this time I was not aware that there may be bleed through to other layers (like a fabric sandwich). A layer of ‘barrier’ plastic drop cloth can be put on top of the leaves to make sure there is no bleed through.

Step #4 Tie the Bundle

To keep the fabric tight to the leaves, wrap at regular intervals quite tightly.

As an extra measure you may wrap the entire roll in a foil or plastic. This will keep the moisture in and not let more in. Each slight variation may give different effects.

Step #5 Steaming (or boiling)

Depending on the type of leaves you have used they may give off odd smells/vapour when they are steamed/boiled. I have read that sumac may be somewhat irritating to some. For that reason I decided to do the cooking outside on the BBQ side burner. Use an old pot or dedicated vessel.

You have the choice of steaming or submerged boiling. I chose to use steaming since it seems like less extra water would effect the print. Make sure the bundle is elevated (on top of some small mason jars or steam basket) and you don’t run dry. You can add metals to the water as extra mordant but I feel that they don’t really get into the bundle when steaming.

The time needed also varies. Some boil/steam for as much as 3 hours and some for about 1.5 hours. I tend to steam for about 2 hours. If you would like extra setting you can leave it bundled for a long time (weeks) or open right away. I chose something mid way. After steaming for 2 hours I wrapped them in a thick blanket to hold heat for a while longer.

UPDATE: As of late I am often using my ‘Alternate Eco Print Processing’ method and it works great and saves so much energy

Since there is generally no indication how things are going it is like Christmas when it is time to open them up. This one was giving me a bit of a sneak peek. I never tire of the opening stage! I bet that is why most find this art form so addicting.

Well, there you have it! I was quite happy with these results!

The amount of detail that these prints made was quite amazing. ‘Like stipple drawings of leaves.

These are walnut leaves were also dipped in iron solution prior to steaming. I love the detail!

Step #6 Neutralize and Wash

After unwrapping you should give them a rinse in a weak baking soda bath to neutralize the iron.  Then wash in a ph neutral detergent like (good for the duckies) ‘Dawn’ or other specialized washing soap. I find there may be a bit of extra tannin washing out, but most of the strong blacks stay put quite well.

If you have too much ‘black’ print then you have a strong iron solution and can dilute it more next time.

So, are you amazed yet!? That is just one simple basic method. There are many more variations, add in some natural colours by using a dye bath with plant dyes and you will be even more amazed how truly magical it is!

Eco Printing Method #2

‘The Iron Blanket’

As a variation of the application of the iron mordant you can also make an ‘iron blanket’. An iron blanket is an extra piece of fabric (even paper towels) that is soaked in the rusty iron water and then wrung out. This layer will be put above the leaves to bring the iron to the fabric in a different way. In this method the leaves are not dipped in iron water, they are used as is (or wetted if dried)

Do you notice a difference in how the colours/prints turn out here? They are now printing the colours outside of the leaf shapes since the iron is applied around the leaf shape. The tannin of the leaf spreads out from the leaf and blends with the iron from the blanket to create the ‘halo’ shape and accent the leaf. Some make soak through the leaf and also print a colour. You just never know exactly…

The Barrier Layer

To keep the colours from bleeding through the layers I definitely use a barrier layer. That can be plastic wrap (Like Saran wrap) or strips of plastic drop sheets (reusable). Some find success in using baking parchment paper, even tin foil as a barrier. I like to use the drop sheets as I can cut off a strip in the width that I am working with.

This is a heavy weight cotton that was pre-mordanted with soya milk. It is soaked in a solution of soya milk and water ( 1 part to 5 parts) and dried and then repeated. This can be repeated as many as 5 times. I soaked in soya 2x.

The results are again quite amazing! I love how they look like water colour paintings! Each specie of leaf can also bring some colour to the mix.

Oh how I wish I could grow some eucalyptus leaves! Go ahead, run out and get some leaves and Eco Print on Cotton. Do check out here before you start on your magical Eco Printing journey. Natural dyes add another dimension (cochineal, pomegranate, logwood, sumac )

Have fun creating botanical prints, so many variables, easy instructions. More complete info here

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101 Comments

    1. Partly, there are quite a few ways to mordant. Using (or making) Aluminum Acetate is one of the preferred ways. I have also heard that mixing alum with washing soda (sodium carbonate) will yield something quite similar, but I have not tried it. Using the tannin(tea, myrobalan)/iron combination seems to make such a strong bond that cotton/linen don’t even need a mordant. This is without a mordant. With all the variables in fabric, scouring, leaves, mordant, temperature, it’s really difficult to pin-point definite recipes. I’d rather leave a bit to chance/magic… Happy experimenting!

  1. Love your process and work Barb. I have printed material. And have seen that transferred. (Blanketing). Can you give me steps or info how to do that. Happy printing. Mary anne

  2. Hi! thank you for all the infromation you share with the world! i am so inspired with your work and entusiastic of the microwave method … It do work! I was wondering if you have done ecoprint by steamming on the microwave.

    1. I have not used a vessel to steam in, but when it’s damp it is in a sense ‘steaming’ since the water particles get very hot and even boil if too long. I avoid boiling as it will burst the bags. See here Have fun!

  3. Hey Barb, I love your amazing share! That’s really helpful.
    I have a question, is it any leaves can be make ecoprint?or I mean What kind of leaves are good for ecoprint?
    Thank you.

    1. That’s a big question as there are thousands of species! And many countries. Check through my posts and see some of the best print ones. Some reliable ones; rose leaves, maple, sumac, walnut, eucalyptus. Try what you have and build up your choices… It’s all fun

      1. Hi Barb,
        Very happy to come across your page while searching for some details on eco printing. I am from India, got some success with the local leaves, not fully. My obsession is driving me crazy. as my artistic sensibilities don’t get satisfied easily 🙂
        The processes you have mentioned, most of them I have tried already. I do understand there are varied factors involved in satisfactory printing, weather, leaves, fibre and the processes.
        I wont get the exotic leaves available in other parts of the world, have to keep experimenting with the leaves around me 🙂

  4. Soy milk is not a mordant. Mordants include tannic acid, alum, chrome alum, sodium chloride, and certain salts of aluminium, chromium, copper, iron, iodine, potassium, sodium, tungsten, and tin. Soy is considered a binder, not a mordant. It may have an effect on pH and change dye colors, but its primary function is to “glue” the dye to the surface of the fabric. It is not considered durable compared to alum mordants as it does not chemically bond with the fiber but sits on the surface and holds the dye to the fabric., so it’s more susceptible to washing and rub-off.

    1. Thanks! I often see/read the term mordant used in the wrong context. I’d rather just have fun with the unexpected outcomes instead of the strict science…

      1. I agree with that Barb, it’s the unexpected results that are the fun in this process. But in respect for those who have taught natural dyeing and written books etc. we should use the proper terminology. It really bugs them when wrong information is presented as facts.

  5. Bonjour et merci pour vos articles très constructifs sur l’ecoprinting. Je joue aussi depuis quelques années et j’ai fait un tas d’essais, notamment par fermentation, nettement moins productive que par cuisson. Mes meilleurs résultats se trouvent avec le Sulfate de fer et l’Alun. Mes meilleurs végétaux : les feuilles de rosiers, les feuilles de mûriers, les feuilles de Sumac. Certaines feuilles ne marchent pas du tout. J’ai vu des personnes obtenir de merveilleuses empreintes très rouges avec les feuilles d’Eucalyptus mais les Eucalyptus que nous avons chez moi (Bretagne, en France) ne donnent pas ce résultat. J’ai ramené des feuilles d’Eucalyptus du Sud de la France mais il me semble qu’ils ne donnent pas un résultat très rouge non plus. Alors je cherche…. Peut-être vais-je prendre contact avec votre lectrice d’Australie qui propose d’envoyer des feuilles ? Ses Eucalyptus sont sûrement différents des nôtres ! En tout cas votre article me donne envie de recommencer mes essais. C’est tellement amusant ! Et l’été, quand il fait beau et chaud, on peut travailler dehors ou dans le garage sans salir la maison …. Mon mari aime mieux ! Je vous souhaite bonne continuation et je vais m’abonner à votre blog pour continuer à lire vos articles passionnants. Bien amicalement !!!

    1. Hello and thank you for your very constructive articles on ecoprinting. I’ve also been playing for a few years and I’ve done a lot of testing, notably by fermentation, much less productive than by cooking. My best results are with Iron Sulfate and Alum. My best plants: rose leaves, mulberry leaves, sumac leaves. Some leaves do not work at all. I have seen people get wonderful, very red prints with Eucalyptus leaves but the Eucalyptus we have at home (Brittany, France) do not give this result. I brought back Eucalyptus leaves from the South of France but it seems to me that they do not give a very red result either. So I’m looking for…. Maybe I will get in touch with your reader from Australia who offers to send sheets? His Eucalyptus are surely different from ours! In any case your article makes me want to repeat my tests. It’s so much fun! And in summer, when the weather is nice and warm, you can work outside or in the garage without dirtying the house. My husband likes it better! I wish you good luck and I will subscribe to your blog to continue reading your exciting articles. Sincerely !!!

      Yes, I have gotten good prints with many of those leaves. Use what you can get and have fun with it. Add a dye or dye blanket and so many options!

  6. Thanks you so much for sharing and I wish I could send you some eucalyptus, I have a huge tree outside my gate.
    I know some people make and sell eco printed dish cloths on hemp and linen but wonder about the constant washing of them, surely they won’t last too long, they are advertised as colorfast. Will they last? Thanks again 🍃