Indigo dyeing yet again

I'm not sure what it is about indigo dyeing but it sure has an addictive quality for me. The pieces below were dyed using the same vat I made up a few weeks ago.

This is one of my pieces above while it was oxidising on the clothes line.

Here is a section of the piece above after finished oxidising and having been ironed.

Another piece oxidising above. 

The piece above has finished oxidising and has been ironed.

I clamped 2 pieces of wood on the fabric above after folding it into a tight rectangle. I was disappointed when I opened it up to find there were some little spots on the white area. When I looked back at my wooden blocks I realised one of them had a little hole on it so some dye creeped in.