Discharge - a taster

In the first day of Bob's workshop we used chlorine bleach and discovered the various colours we could get from the cottons we'd brought. You had to work fast applying the bleach. The next day was much more exciting - we used thiox and also formisol, which work on silk and wool as well as cotton. You didn't have to rush the application, as the colour appeared (along with the toxic fumes) when you ironed the now-dry fabric. Here it comes:

And you can somewhat control the depth of colour (or rather, of discharge) during the ironing. And then rinse out, dry, apply more, dry, iron more ... etc ...