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Tie dye supplies
If you want to create geode style tie dye, I recommend using artificial sinew (waxed thread). Some people use rubber bands but I found that to be tedious and time consuming. I've also been able to use zip ties but those are difficult to remove and wasteful.
I usually prefer ice dye, but when I want to use liquid dye, I love this small dye application bottles. The tips are tiny, allowing you to poke them into the folds of the fabric, making sure it's well saturated.
procion dye
I enjoy using Jet Black from Jacquard. All of my other dye is from Dharma Trading Co. It comes in many colors and they have great customer service.
Soda ash is used with fiber reactive procion dye, to "fix" the color (make it permanent). When presoaking with soda ash, use 1 cup of soda ash with 1 gallon of warm water. You can skip the presoaking step and just sprinkle the powder on top of the ice, when ice dyeing. If you're just getting started with tie dye, you can order small amounts of soda ash, to try it out. I currently use a huge bucket of soda ash that I ordered online. You can also find large quantities of soda ash at local pool supply stores, as well.