I warn you that this is very very chemical and I think sévaporant smell of it should certainly not be inhaled.
I used to dye Poly iDye a yellow chick dress, she became gray / khaki, it's quite disappointing, the result is not optimal. Second, the use of this product requires an object (like a pot) NOT FOR KITCHEN, because after having used the product, it is a horror, the pot is black, the sink may be, too if you dump wrong water in it! (Yes attention to that), and when I had to stay in my kitchen to mix it all for an hour, the air was unbreathable, it was really toxic, I had to cover my nose and mouth breathing .
So, to conclude that the use is complex enough for me and dangerous, and this does not give a black pigmented enough for my taste, perhaps is it made for smaller formats, so less water used .. . I do not know ...
A little disappointed ...