I doubled the chemicals in the indigo vat: the same again of powdered pre-reduced indigo, soda ash (instead of lye) and thiourea dioxide (which really stinks). It seems to have cheered it right up. I cut up a bunch of new pieces of white and neutral fabric in many many textures and weights.
This piece is a standard shibori resist on plain cotton. I pulled the fabric tight over a penny, and rubber-banded it. The circle of the penny is barely visible, and but the rubber-band resisted the dye and kept the white line white.
A front seems to have gone through, and the weather is a little dryer. Easier to sleep, I hope!