Fiber Reactive dyes are definitely not the same as RIT. RIt is known to fade or bleed. Fiber Reactive dyes are the best dyes for fabrics and can be purchased at www.dharmatrading.com If you poke around their site a bit you'll find the information there about how to dye and anything else you might need. I recommend purchasing some Synathropol as it will keep the dye is suspension and prevent it from running. Soda ash is used as a mordent and can be purchased at your local pool supply store under name brands such as Ph UP or Ph Rise.