A grand day out

A few weeks ago we went out for a Grand Day Out!

On the 27th September 1066, William the Conqueror set sail from St Valery sur Somme for England. So we decided in this anniversary year that we should go and have a look! We collected some friends and meandered along the Canche valley to start with, then on to the Baie de Somme and the little town of St Valery.  What a beautiful place!

 It's fairly obvious that the town has spread from what it was in the 11th Century, but there is still a core at the top of the hill that is original.

Cobbled streets lead up to the "William Tower" which is also where Joan of Ark was held prisoner in the 15th Century (according to a plaque on the wall.) not sure whether it was one night or longer....



The Baie itself is beautiful, an absolute haven for wildlife, you can walk across to Le Crotoy on the opposite bank when the tide is out - we took the train, a story for another day!



 This picture speaks for itself - it's in the spot (supposedly) where the boats set sail from, now in the middle of the walkway with a road on either side. I suppose with 1000 years having passed the course of the river will have changed.....

I've been meaning to reproduce the colours of the Bayeux Tapestry for many years and so in tribute to the anniversary they were launched in August. Madder, Weld and Woad have given a really lovely range of colours, alum and iron were the only additions.

The dreaded subject - Chemistry

When I started writing this blog post I soon realized that it would be very, very long – I have pondered long and hard about whether it should go here or I should try and get it “in print” – it’s not until you start writing that you realize just how complex it all is to explain!!! For this reason I have decided to split the whole thing up into several posts.


For many people indigo is magic but they are simply dyeing with it for the experience rather than wanting to take it further, a simple dye kit or 1 day workshop is great and will satisfy their requirement. For others indigo “bites” and becomes such an integral part of their dyeing repertoire that they really need to understand everything that is happening in the bath and how works. Sadly very few seem to! If you are a professional dyer and particularly if you are writing a book it feels criminal to me that you cannot explain properly how the colour blue is obtained. One of the biggest insults (and reason behind starting all this writing) is when I read (or hear someone say) that it is “normal” for indigo to rub off.

Nooooooooo!

So here I am keeping my promise! I said I would lay my own neck on the line and give what I understand to be the chemistry going on in the “indigo” bath.-

Perhaps I should say here that I have no chemical training further than I took chemistry to A level way back in 1974 and failed it (well got an O level pass, but I already had the O level so......) From then until I took up natural dyeing the only links to the subject that I had were with the nutrition and food poisoning I had to study for my catering qualification. What I am trying to say is that this is a layman’s version, not a chemists!

I would like to start with clarifying names. Everyone talks about dyeing with “Indigo” but that is incorrect, the ACTUAL name of the blue dye chemical is INDIGOTIN (I don’t care how you pronounce it, but that’s how it’s spelt!) So throughout this ramble that is the term I will use when I am talking about the blue dyestuff. ( I feel that we would all get less confused if this term was used more often!)

I am not intending writing here how I use the dye but my understanding of what is chemically happening from the point at which you pick leaves from your chosen source plant and end up with a blue colour on your textile.

When doing a period demonstration dyeing with woad I start by saying::

“There is no blue dye in the leaves,- there is a “precursor” chemical and a naturally occurring chlostridia bacteria in there and when you tear the leaves up into little bits you release the chemical and bacteria into an environment they find suitable for the process of change to begin”

So let’s go through the best known of the plant sources and their “precursors” To clarify what I mean by this - there are many plants which contain a chemical within the leaves that can be converted into indigotin, the plants come from different countries, they are from different family groups and they contain a different chemical but ultimately they can make the required conversion.( I should perhaps also say that different methods of preparation can also be employed for the different plants.)

The Isatis family - Woads

It has not long been known that there is an Isatis family! This is currently under research - there seem to be more varieties than previously thought!

Isatis tinctoria (Woad)

Occurs in a wild state throughout Europe but is thought to originate in Russia. It was not native to England but was cultivated there as it was in Germany and Central Europe. It also can be found in Africa and Asia.

Isatis Tinctoria L. Var. Yezoensis (Ohwi)

 Found in Korea, China and Japan growing wild on hillsides

Isatis Indigotica (Chinese Woad)

This plant has not been found in the wild, only as a cultivated plant.

There are 2 major precursors in Woads – isatan A and isatan B. Indican is also present, but in a very small quantity, so is only a minor precursor for this plant. isatan B and indican are both converted by the same enzymes however isatan A requires a different enzyme. There are other precursors also present but in much smaller quantities and they have yet to be named!

The indigofera family.

This is the most important and largest of indigotin producing families – it is also found in most parts of the world. There are approximately 700 species occurring in sub tropical conditions – so they can be found in the Americas, Asia and Africa. There are no native species in Europe or Australia The ones most commonly known are:

Indigofera tinctoria

 this is sometimes called Indian Indigo Its origins are not known, but are assumed to come from India, although it can be found as far away as South America and Australia

Indigofera .suffruticosa

 Found in Central and South America it has been cultivated in many tropical countries due to its high indican content.

Indigofera arrecta

 Sometimes called Natal Indigo it is native to Africa particularly tropical Africa often at higher altitudes.It was introduced into Java and India.

Indigofera coerulea

 Is found in Sub tropical Africa from Mali to Somalia, also found in Algeria through Arabia to India. This plant was cultivated in the drier area to which it is well suited.

The Indigofera plants all contain the colourless precursor chemical indican in the leaves. The indican content varies from species to species, in the age of the plant, the age of the leaves and even the time of year. For example there is more indican in the young leaves of an older plant that in the young leaves of a young plant, there can also be more in the top leaves of a plant than the bottom! The dye yield from Indigofera arrecta is higher than from any other of the Indigofera species.

Persicaria Tinctoria - Dyers Knotweed

Also known as Polygonum tinctorium it is a native of Vietnam and Southern China. It was introduced in to Japan in the 4th Century AD and became the main source of indigotin.

Again the precursor chemical found in this plants is indican

Around the world there are many more plants which contain precursor chemicals principally indican and they are used by natives of their country. For a more thorough breakdown of all the plants please refer to Natural Dyes by Dominique Cardon her book is by far the best breakdown of what is known at the present time of all the indigotin bearing plants (in my humble opinion!) .

Copyright © Debbie Bamford 25th March 2011

Our other kind of work

Last Saturday found us working in the middle of a field in Penryn, Cornwall, doing what seems to take up virtually every weekend from May through to certainly October, with some of November and December thrown in! We were doing period demonstrations - on this occasion early Medieval - but it can be anything from Roman through to the advent of chemical dyes (Victorian). We dress in the appropriate clothing and talk about whatever our subject may be for that day. Normally I get to be a dyer, although sometimes I am a spinner and occasionally I even get to be something totally different. John has far more variety, he is an apothecary, or a pin and needle maker, or a cartographer (his Saturday job!) or plague doctor, or jet worker, lots of varieties of John!

The top picture is our 2 awnings side by side, dyer on the left and cartographer on the right. We both had lots of interest over the day - it was so wet that anyone who actually turned out had to be interested! Really the residents of Penryn were fabulous and came out in quite large numbers!

This is John's table with beautifully made sun dials (but no sun, so we couldn't tell the time!) actually you can see three versions of sundials, the one hanging up is a shepherds dial and was carried round, the one flat on the table is a Capuchin dial and the one whose face you can see on the stand is an Equatorial dial. He has a selection of maps and devices for measuring distances and writing implements for doing his mapping.

I have a dyebath - well actually its a twin tub version I have the ability to have 2 colours on the go at any one time. Usually I do onions skins as they are really simple and woad as it is very complex (and magic!). There are a selection of hanks hanging up - they are hung out like this everytime and have been in use I would think for at least 8 years. The madder, weld and woad have not faded at all, the brazilwood on the left has faded quite dramatically - it was only an exhaust bath so was never particularly dark and paler colours are known to fade out first - the hank is almost white on the outside and very pink on the inside. The same applies to the turmeric hank at the other end, it is virtually white on the outside but very yellowy gold on the inside. The tops that are on the far right have been dyed in an exhaust onion skin bath, they are actually darker than they look here.

We are normally allowed to trade at these events so in the background you can see a small selection of stock as well. There is a tray of silks, some cloth hanging up, linens in their trays, wools in baskets and some of John's woodwork. At the front of the table is a box with some dyestuffs in and madder root, a woad ball and a pomegranate husk on top, then there is a medieval piss pot and a glass bottle with essence of John in it!

We have put a tremendous amount of time into researching what we do, so it's great that we get these opportunities to use our knowledge to educate people, especially children. I love watching their faces when I pull a piece of cloth out of the woad bath and ask them what colour it is - "yellowy or greeny" they say, "oh no!" I say "it's blue!"