I am not an expert, as I have recently started experimenting with hair lighting. However, this developer is significantly better than cheap lightening kits. It doesn't immediately saturate the hair and allows for better distribution of the mixture. I combined it with Ronnie's silver powder. It helped even out the patches from my previous unsuccessful experience, and the result was already better. I haven't completely removed the copper tones yet, but I'm not upset because I am transitioning from dark chestnut to a lighter shade, so it will take some time. I hope to finish my lighting process in the next iteration and fix it with a light dye.
If you are attempting to lighten long hair below the shoulders on your own, it is better to get at least a 250ml jar right away. It was just enough for one good use. Next time, I bought a liter bottle, realizing that it's better to have these consumables in reserve to adjust the necessary amount of the product depending on the situation.
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