Woad - Isatis tinctoria

My first dyeing experiment was with Dandelion flowers which I picked where they grew as weeds.  Then I tried Rumex root and I have to say that there is something extremely satisfying in using something useless like a weed to make something useful and even beautiful.  The next level is to grow plants specifically for the purpose of using them to dye.  There are a few traditional dye plants that are particularly good but none of them are natives.  So I bought some seeds and sowed them this spring.  They all grew very well and as a consequence I have been busy experimenting this summer.

I have tried to be organized and have documented all my steps and I set up a system to store my samples.  For me, it was a piece of carton, punched with lots of holes and folded.  This way it's easy to attach the yarn samples.  Then I put all the cartons in a big ring binder.

I planned the experiments early this spring and the plan was to use:

1 piece of un-mordanted wool
1 piece of wool mordanted with Rhubarb leaves (since I'm a bit fascinated with Rhubarb)
1 piece of wool mordanted with Chrome
6 pieces of wool mordanted with Alum...

...5 of which would get the following treatment:

1 piece modified with Iron water
1 piece modified with Copper water
1 piece modified with an acid solution (citric acid)
1 piece modified with an alkaline solution (washing soda)
1 piece modified with Tin

I also planned to dye a sample of alum mordanted cotton and linen, as well as a small piece of silk, but for some reason I kept forgetting to add those to the dye bath.  Also, I never used the Chrome or Tin.  That will have to wait till next year.

I was very excited to experiment with the Woad.  To get a blue colour from green leaves is like magic and I wanted to try to do that myself.  I probably have well over 20 books about dyeing and have read them all and most more than once.   My favorites are two books that I have by Jenny Dean, especially Wild Colour, and I also like very much a book that was written by a couple, Dye Plants and Dyeing by John and Margaret Cannon and illustrated beautifully by Gretel Dalby-Quenet.

Woad, Isatis tinctoria, is a biennial and a native of Europe.  It grows so easily that it is classified as a noxious weed in some places in the US.  I found it very easy to grow here.  I sowed only 6 seeds and they all came up.  I'll be sowing more next spring since one needs quite a bit of the leaves to get a strong colour.   The best colour is from first year leaves, And the plant is a gready feeder so give it plenty of nitrogen rich fertilzer.  To get an harvest of fresh seeds one needs to let the plant grow in the second year.  Woad leaves need to be used when fresh, so no freezing or drying will work.  The process is very similar to that of Indigo dyeing, but Woad leaves do not tolerate too much heat, i.e. no boiling.

One can harvest the Woad a few times, I got three harvests before the cold set in.  It's important to weigh the leaves to know how much wool can be dyed.  I had about 120 grams, from my first harvest. Not a whole lot, but I did manage go get a very pretty blue.  The blue of Woad is much lighter than the dark blue of Indigo and I don't think of Woad as a substitute for Indigo, but rather a completely different blue.

The leaves were chopped and then I poured hot water over them and let it sit for an hour.  The water should turn a sherry colour.  When the temperature is about 50°C /120°F the pH should be dropped to 9, using washing soda and then aerated by pouring from one vessel to another until the foam turns blue.  Mine never really turned blue, but a blue green, but it seemed that that was enough.  Then one adds hydrosulphite to reduce the oxygen content of the vat and lets that sit for 30 minutes or so.  The liquid should now be a yellow colour.  This is the stage that the dyeing can take place.  To dye, either yarn or cloth no mardant is needed, just dip it in for a few minutes and take it out again, being careful not to stir any oxygen into the vat.  The fiber will magically turn this pretty blue colour right before your eyes.

Not many dye books speak about modifying Woad dyes colors, but I did that anyway.  I love the un mordanted blue (one more light than the other, that is the second dye bath), but also the greens that came from the Rhubarb mordanted wool and Copper treated.  The latter I just let sit in the modifyer until I see some effect in the change of colour.  I applied no heat, but the time could be anything from a few minutes up to 24 hours.  I could quite see repeating those experiments is larger quantities next summer.  The other colour chart shows some slightly pink colours, those come from the exhaust bath and I treated them in the same way:  Unmordanted, mordanted with Alum, mordanted with Rhubarb (úps - I forgot that one!), aftertreated with Iron, treated with Copper, treated with Acid and treated with Alkaline.

Plant Dyeing - The Basics

Using natural materials to dye textiles, plants mostly, is an incredibly satisfying activity.  It doesn't cost much and guaranties an increased awareness of nature and long outdoor walks.  It is also surprisingly easy to do and predictably unpredictable, as tends to be natures way.

Most plants will yield some colour, the most common (and consequently least desirable) is a yellow green/greenish yellow and brown tones and they may not be very fast to light or washing.  Some plants produce more clear and durable colours and have become known as dye plants.  Just as medicinal plants often have the second latin name of officinale, the ending tinctoria denotes well known dye plants.

All parts of plants can be used to dye.  Many roots give great colour, like Madder and Alkanet.  With some plants it's the leaves that are used, like Woad and Weld.  Or it can be the flowers, as is the case with Dyers Chamomile and Lupin.  Barks of shrubs and trees are also a source of colour, like the exotic Brazilwood and Logwood, or simply try Cherrywood prunings.  Some mushrooms give great colour and of course Lichens.  And then there are the insects, like Cochineal and Lac.  The possibilities for experiments are endless.

Most of the time, one uses one part plant material to one part of wool (or other textile).  The plant material is chopped up into small pieces and simmered (80-90°C/ 180-200°F), most often for an hour or so, to extract the dye.  Flowers should be shimmered at a lower temperature or they tend to give browner colours and barks and tough root need a longer time.  The dye solution is strained and cooled before it can be used to dye wool.

The dyeing process itself is simple.  The easiest textile to dye is wool and it's easier to dye yarn than fabric.  At least to get an even colour.  The wool is wound into skeins and tied in several places (The tie should be in a figure 8).  The skeins need to be wetted (and possibly scoured or washed) before they are put into the dye bath.  To wet the wool let it sit in room temperature water for at least an hour and squeeze out all the air to make sure it is completely we through.

I tend to make the skeins 20-50 grams / 0.7 to 1.7 oz and tie them in 3-4 places.  The wool is immersed in the dye solution and water added if needed.  The wool needs to be able to move around freely in the dye solution.

One thing that is a bit surprising to beginners is that the intensity of the colour isn't determined by the amount of water in the dye solution, but by the ratio of dye material to wool (or other textile material).  So to get lighter colours, one uses less plant material.

Since wool is very sensitive to sudden changes in temperature, it needs to be heated gently.  It should take at least one hour to reach simmer.  Most of the time the wool is simmered for an hour to get good saturation and to make sure the colour is fast.  If the wool reaches the desired strength of colour sooner, it is best to continue to simmer it in clear water for the rest of the time to insure the best fastness.  Just make sure the temperature of the water is equal to that of the dye solution.  The used dye solution can be used to dye more wool until all the dye is exhausted from it.  That way one can get a few increasingly light tones of the same colour.

Most of the time the wool needs to be mordanted before it is dyed.  Without mordants, the dye won't adhere to the wool and simply wash off.  The exemptions, substantive dyes such roots, do not need mordants, and barks contain tannins that are mordants.  Lichen are also substantive as are Onion skins and Indigo.  Mordants are most often metalic salts, the most common being Aluminium sulfate (Alum for short).  Alum and Iron iron (ferrous sulphate) are quite safe to use, while the other frequently used mordants like Tin (stannous chloride), Copper (copper sulphate) and especially Chrome (potassium dichromate) are toxic and need care in handling.  Each colour affects the final colour differently.  Most dyers prefer to work with Alum.  It is not toxic and give clear colours and good fastness.

The best pots to use are stainless steel.  Pots made of Aluminium, Copper or Iron will affect the colours (very much like the mordants) so they can be fun to use.  I have gotten most of my dye pots from thrift stores for very little money, so this doesn't have to be an expensive hobby.  Substantive dyes do not require a dedicated set of dye pots and equipment so they are perfect for beginners.

Peachy - Liquid Soap

The other day I wrote down all the ideas that I had for my next soaps.  I wanted to do a liquid soap by rebatching and I wanted to do a peach coloured soap, among other  things.  The peach colour came from the colour I got from a Woad exhaust, a really nice pale peachy colour.  It's so strange how that works.

But anyway, I dyed a long silk scarf and got this colour, instead of the blue that I hoped for.  But I loved the colour and it reminded me of some elastic that I picked up the the Good Shepherd, purely because I loved the colour, not because I had any use for a lot of elastic.  I have no idea what I want to do with it.  Although it probably could be designed as a very funky-something-to-wear if I were a bit younger and could carry off some funky clothing.

But back to the soap.  I had one soap left of one of my favorites, the Madder soap with Neroli that I rather selfishly made just for myself.  The colour was long gone and the scent wasn't really noticeable any longer either, but it was white and hard.  I had loved the feel of it, the smell of it and I remember that the lather was really nice.  So I grated it into a pot and poured some fresh cream on top, as well as a bit of coconut milk and some water.  I heated it gently and stirred to melt the soap.  Then I thought: Wouldn't it be nice to have a bit of colour?  So I went to my stash shelf and picked op a jar of Rhubarb oil.  Pink liquid soap!   I've made a quite a few nice pink soaps using both Rhubarb oil and Rumex oil and I always really like the nice pinks I get.  So I poured it in and magic:  It turned this nice peachy orange.  I was delighted.

With that colour the scent just had to be Ylang Ylang, Sweet Orange and a bit of Sandalwood, for depth and a tiny dash of Cubea Litsea for a fresh top note.  I added a little bit of Natrium benzoate a a preservative and some glycerin to help to keep it from clumping up.  Now I just have to wait and see how it ages.

Since I don't have it in a pump, it won't really matter if it thickens a bit, but I would like to be able to make liquid soap that can survive in a pump without having to use KOH.  The kids have been asking for that and I've been meaning to do some experiments.  Although one of these day I'm sure that I will treat myself to 25 kg. of KOH and start to really experiment with liquid soap.  But in the meantime I'm perfectly happy to compromise and rebatch my leftovers to get some liquid soap.  It's so important to remember that it doesn't have to be perfect.  That's the beauty of making stuff oneself.  It's not only just fine if it is slightly imperfect, it's actually better.  It's more human.  It's more me.