Indigo looks simple when the cloth turns blue, but a vat is a material system with its own product, conditions and safety document. Learn the questions before copying a method.
Understand the change
Oxidation is part of why indigo cloth changes as it leaves the vat. A visible shift can explain colour, but it does not provide a recipe or guarantee a result across products.
- Observe before and after
- Record the exact material
- Keep the product name
Treat the vat as a safety question
Compound data and a workshop anecdote are not substitutes for the current label and SDS of a commercial formulation. Ventilation, exposure route and disposal need their own check.
- Read the SDS
- Do not generalise hazard data
- Follow local requirements
