I have porous, wavy medium /thick dark brown to black hair.
I tried a couple of the Nutrisse shades for at home balayage (Cool Tea 51 and Cool Brown B1. Reviews below.
9/2018 : Nutrisse Cool Tea 51 "Medium Ash Brown" (2 stars)
Four years ago, I did a sucessful and subtle at-home balayage with Nutrisse ULTRA Cool Brown B1 "Ultra Lightening Browns for Darker Hair" (5 star review below). However, it was discontinued last year. I bought the regular (non Ultra lightening) Nutrisse Cool Tea 51, which Garnier linked to as a substitute for the B1 on their website. The color and shade description on the box did look similar.
I did the same thin streaks technique as before, going even a little chunkier. But the result was barely noticable on my (virgin) very dark brown hair. Unlike the B1, Cool Tea 51 does not specify "Ultra Lightening", so this might have been the reason why it didnt lighten as well.
Cool Tea also did a poor (25%) job of covering the two small areas at my temples that are graying right after using it. Then the small amount of color it did deposit all but vanished in a few weeks. (In the past, the now discontinued B1 ALSO had the same result, so I ended up using a small amount of dark brown Loreal Feria IIRC, which covered everything nicely).
Overall, I can only give this shade 2 stars as it did not do much. (1 star for the bearable smell).
I'm still hoarding two boxes of B1 ultra Lightening that i bought a couple years ago for fear that this would be discontinued.
Garnier still sells Cool Brown B1 with newb packaging On thier website, the shade got a lot of bad reviews. Many people were complaining that either it did no color lifting, or that it left brassiness or "hot roots" (when oots turn orange-y/bright due being overprocessed because of the heat from your scalp). Guess I'll be holding on to my two old boxes. (Maybe they tweaked the formula)?
(Oct 2018: Garnier customer care told me not to worry about the product expiring.)
According to Salley Supply's website, unopened hair color has a long shelf life:
"Hair color products used to have freshness dates stamped on them. Some still do, but manufacturer testing has shown that the shelf life of hair color is almost unlimited if the bottle has never been opened."
9/2014 : Nutrisse Ultra Cool Brown B1 (5 stars)
This Nutrisse Cool Brown is part of a small collection of "Ultra Lightening Browns for Darker Hair.
I wanted very subtle highlights and was hoping to find an at-home hair color that would not look brassy or orange on my very dark brown hair, which has a lot of red undertones. I hadn't colored my hair for many years, but I found it fairly easy to use.
I used it for at home bailayge (p). I applied it to tiny sections (10-20 strands) at a time with the edge of a brush, concentrating product on the ends, and diffusing it up with my (gloved) fingers upwards until it got 1-3" away from my scalp. The result was subtle highlights that added dimension, and no roots (it was completely unnoticeable as it grew out). The color result was a nuetral chocolate tone with a hint of gold and red (pretty close to the box color). It was only a shade or two lighter than my natural color, which is exactly what I wanted.