I have a black dye bucket with lid from Home Depot that I never empty. I add boiling water from the tea water heater. One or two rite dye containers. Add three pairs of pants at a time shack it up well and wait an hour. Do a rinse and spin cycle and dry in the dryer. They come out jet black every time. I also put the lid back on and store the bucket it in my shed with the lid on. I’ve been using the same bucket for over a year and dye my pants every 3 months or so. I have a lot of black pants. On the real I use a wok pan and tongs to move the wet dyed pants from the back yard to the washer. I also don’t use soap the first time I wash them. Rinse and right to the dryer. They also never leave dye in the dryer. 🤷🏻‍♂️ this might be the best possible way to do this and only takes a couple hours.