Quantity of Indigo Paste in a Vat

Q: What quantity of indigo paste do I use to make a vat?

A: I recommend about 15g of the paste per gallon of liquid used to make the vat.

For a 5 gallon ferrous vat I use 60-75g of the paste, 100g iron and 150g lime. After dyeing for a while, I'll usually sharpen with a half dose (50g iron and 75g lime) to stretch out the vat a little bit and do some paler shades of blue.