The Mineral Vat: Completing Our Indigo Week Vat Trilogy

Today we completed the final vat in our Indigo Week vat-making series.

Over the past three sessions, we have explored three very different approaches to bringing indigo to life.

We began with a Fermentation Vat, a living system that relies on microbial activity and develops gradually over time.

We followed with an Organic Fruit Sugar Vat, using fructose and lime to create a more accessible route to reduction.

And today we completed the picture with a Mineral Vat.

If the Fermentation Vat teaches patience and the Organic Vat teaches observation, then the Mineral Vat teaches efficiency.

Using iron and lime, the Mineral Vat creates the conditions needed for indigo reduction through a very different mechanism than the other vats we explored earlier in the week. It is often quicker to establish and can provide an excellent way to understand some of the fundamental chemistry behind indigo dyeing.

Throughout the session we discussed pH management, ingredient selection, troubleshooting and the practical realities of maintaining a mineral vat. Questions ranged from pH testing and lime additions to pigment composition and how mineral vats compare with other reduction methods.

One of the goals of Indigo Week has been to show that there is no single "correct" indigo vat.

Every vat is a compromise between different priorities.

Some prioritise tradition and long-term development.

Some prioritise accessibility.

Some prioritise speed and simplicity.

The most suitable vat depends not only on the dyer but also on the circumstances in which the vat will be used.

By building all three vats side by side, participants have had the opportunity to observe these differences directly rather than simply reading about them.

For many people, this comparison is often more valuable than learning a single recipe.

Understanding why a vat behaves as it does makes it far easier to adapt, troubleshoot and make informed decisions in the future.

As I looked back over the week, one thing became clear.

The vats themselves are only part of the story.

We have travelled from ancient indigo history with Dominique Cardon, through community and cultural connection with Rosa Chang, into the world of sukumo making and traditional Japanese fermentation with Britt Boles.

Now, with three vats quietly developing around the world, we have reached the practical heart of Indigo Week.

But we are not quite finished.

This evening Tristan concludes the main presentations with his Indigo Variety Trials talk, and in the coming weeks we still have our Indigo Dyeing Session and Troubleshooting & Maintenance Session to look forward to.

For now, however, our three vats sit side by side.

Three different paths.

One colour.

Blue.

Indigo Week is part of our Full Membership programme, giving members access to live presentations, discussions and demonstrations from leading indigo practitioners around the world. Every session is recorded, so members can revisit the material at any time and catch up on any presentations they miss. The growing library of recordings has become an invaluable resource for anyone wanting to deepen their understanding of indigo growing, dyeing and fermentation. 

You can join our Full Membership here  Or the free Academy community here