It is a good job that I have a Plan B as my experiments over the last week or so have failed to give me a 'WOW' moment. The results didn't even fall into the 'Ugly Duckling' category of pieces that might fit in with what I'm trying to achieve with some additional process. The experiment has been educational but not in any way that is connected with what I think I'm trying to achieve.
I started with 8 pieces of cotton each 'marked' with a different medium. It turns out that my water resistant acrylic ink didn't put up much of a fight and washed out when put in the soda bath to soak. The soda solution was a beautiful turquoise colour as I poured it down the drain. Luckily (sic) the colour washed out so sucessfully that I can reuse the piece of cloth. The remaining seven, soda soaked and dried pieces were pinned to the bench and a layer of colour added using an open silkscreen.
After batching them I washed and dried the pieces. The original marks were all clearly visible below the layer of colour. The lines I had made with dilute acrylic and with acrylic mixed with Golden Matt Medium looked a little faded and fuzzy but the rest appeared unchanged. I then stripped out the colour using two methods. One half of each piece of cloth was discharged using Formosol mixed with print paste and applied through a screen. The other half was discharged using the cheapest bleach I could find (40p for 2 litres - bargain!) and a fan brush.
The Formosol discharged to a fairly consistent colour irrespective of the original colour. The bleach gave a bit more variation and also some different colours. Neither method affected the original marks. Hmm ... I had been hoping for some really interesting chemistry to happen that maybe striped back or somehow changed the first layer of marks. Instead discharging added colours to the fabric pieces that created a palette that reminded me of street lights glowing in the dark. Which has got me thinking about something else ... maybe the beginning of something else? So the pieces will be hung on a small design wall to contemplate whilst I move on to Plan B!