Indigo Vat Mixing Temperature

Q: Do I need to use hot water to prepare my vat?

A: No. You can use cold, warm or hot water. The warmer the water, the quicker the reaction between the lime, iron and indigo will occur. I've had vats ready to dye in as little as an hour with very hot water, but a cold water preparation works exactly the same, just takes longer to develop at around 24 hours.