Instructions come with the chemical, which can also be found here. I'd also seen a variation on the blog of Purple Missus. I did a sort of hybrid method by adding the strong tea brew to the caustic soda solution. I found this knocked back the bright colour created by the iron rust, creating a muddier greying the longer the fabric was exposed. My first reaction was that this had spoiled the effect, but now the cloth is dry and pressed, I think the effect is of extreme ageing which certainly has its place in my palette. I dyed another length of calico with no tea/tannin added and this was much brighter by the time it dried - it's the fabric at the top of the picture. As in indigo dyeing, what you fish out of the pot is not what you eventually get.....
So here's some cloth to add to my collection, and I'll have to think about what I'm going to do with this technique to move it on. It would be interesting to try some rust transfer dyeing over this base cloth to create greater variation, and to consider tie dye techniques and using the tea to create pattern on the surface by dipping, dribbling or shibori methods. Meanwhile, I have these pieces to play with.
