Q: I have had great results working in a 5 gallon container but want to be able to dye yardage and large pieces. I've never dyed in a larger container. Can I use a large trash can (32 gallons)? Do the proportions simply need to be multiplied by 6 to account for the size?
A: Essentially, yes! To work in larger dye vats, you must scale up the amount of each of the vat ingredients to get it to behave similarly on the larger scale. You're leaving the realm of working with kits when you start using containers larger than 10 gallons. Take a peek at the page on my website that goes more in depth on creating your own indigo vat from scratch : Indigo Vat Basics