A film series and discussion forum dedicated to the science and practice of natural dyes and pigments using sustainable methods.
About fermentation in indigo vat..
I propose the following explanation:
There are three kinds of vats —
Of course, the organic vat will be converted sooner or later to a fermentation vat, but the interesting point with the organic vats is that they are quick and efficient, so we can use them for demonstrations, when travelling, and to improve fermentation vats which are supposed to be difficult to do.