Here's what I used for each dye bath:
4 quarts water, heated to 185*
1 1/2 tsp dye powder
2 tablespoons citric acid
2+ oz of each fiber
Jacquard Acid Dye #620 Hot Fuchsia
Dharma Acid Dye #406 Fluorescent Fuchsia
Country Classics #COC31F Very Hot Pink
Gaywool Acid Dye in Rhodamine
washed merino locks
Jacquard's Hot Fuchsia, has been a staple in my dye set for years. It produces a clear, very saturated depths of shade with very little dye. It's very easy to use, and exhausts very fast. It washes pretty well, and wears well. Fading some over several washes, but retains it's vibrant color. It's a nice clear hot pink on natural fibers. It goes ballistic when introduced to anything nylon. We're talking black light neon, in the best possible way. Some may find this disconcerting, I personally adore it. The dye isn't fugitive, once it's set it stays. I rinsed all fibers in a 140* water bath. Overall, Jacquard is a winner. Great dye economy, a pinch will produce vibrant shades. Try it on nylon or milk fiber for wow factor! See Dharma's info page for further info on solubility, light fast, etc.
Dharma's acid dye range is relatively new. Don't let that throw you, it's a great dye range. Their Florescent Fuchsia is bright. It dyes well, and is fairly concentrated. It's a little cakey, and needs a bit of stirring to dissolve in the dye water. It dyes well, clearly and provides a vibrant shade. It bleeds a little with the rinsing, maybe the only downside. The color is similar to Jacquard, maybe a little darker. It dyes the nylon neon as well, but not as neon on the protein fibers. See Dharma's page for more info on washfast, light fast, solubility etc.
The Very Hot Pink is the only dye that isn't concentrated. This is because the fixer is included with the dye. The One Shot is simple to use, unlike the other dyes; no citric acid is needed. The color is light on protein fibers, and neon on nylon. It striked faster than the other dyes, which is great if you're in a time crunch. It's important to wet the fibers you're dyeing well, with this dye. Otherwise you'll get mottled coloring. I like this dye, but prefer their Washfast range, since it is more concentrated. *note: Prochemical sells the same shade as "Washfast" that is concentrated-with no fixer added. (I didn't sample Washfast, but have used it in the past)
This brand of dye is new to me. Thanks to Louet for sending me a sampler pack to play with! The written instructions could be a bit simpler. I suddenly realized, it's used the same as the other acid dyes. I'm not the best when it comes to instructions, they're more like suggestions. I didn't use the Glauber's salt, and Lyogen H assists, on purpose as an experiment. I assume, they are recommended so the dye works better. The results were really good, even without the assists. Which is great, since I love to keep it simple. The dye is very concentrated! It was the most concentrated of all the dyes. I would categorize it as crazy concentrated. You could easily use 1/2 a teaspoon in 4 quarts of water, to achieve very dramatic results. It has a heavier smell than the rest of the dyes, even with a mask it was noticeable. The Rhodamine dyes great, but did exhaust well; leaving some pink in the leftover water. Possibly if I used the assists, it would have been different. I need to explore that further!
Overall, each dye is awesome. It comes down to brand loyalty, and budget. Gaywool does run higher in cost, but it's exceptional saturation of color makes it worthwhile. The cheapest dye is the Country Classic, it's okay but not a favorite. My favorite for dyeing wool, etc is Jacquard (surprise!). My favorite for dyeing neon hot pink turned out is Dharma's Acid Dye. Jacquard exhausts the best, which is very desirable. I have a septic tank, and am always aware of the dyes effect on the system. There's subtle differences with each color. More depth of shade, vs color. Gaywool's Rhodamine is very concentrated, and the winner if you want a very dark hot pink. I hope you try all the dyes, and explore them for yourself. Hot pink is a fantastic color, and truly is a favorite!