On Japan’s very strict 4-grade colorfastness rating scale, with 4 being the best possible grade, Green Valley Color® clears grade 3. (By way of reference, most fast fashion product colorfastness and crocking test results fall between a 2 and 3). Specifically, Green Valley Color® remains slightly weaker than chemical dyes under prolonged exposure to ultraviolet light, and darker or more saturated applications tend to be weaker than the best chemical dye applications in wet crocking tests.
Regarding “Color Bend”
It is difficult for our botanical dyes to perfectly color match chemical dyes. Please note that slight variations in the botanical pigment base can lead to greater color differences between specific dye lots than that seen with chemical dyes, a feature that we call “Color Bend”. One reason for this is due to a characteristic particular to botanical dyes: Even for a single red color, the sub-micron pigment particles are not all singularly red, but rather are a variety of colors that, in combination, appear to the eye as red. Because this is a diffuse reflection, the “red” color expressed or returned to the human eye is a soft light with a unique depth. Also, because the base pigmentation is a natural material, even seasons and the dyeing environment influence the final results of the dyeing process. The outcome is not unlike differences in fine wines – even the most ideal conditions will yet yield slightly different wines from year to year, even at the same winery. In this respect, botanical dyes respect and follow the laws and sensibility of nature, and the best way to work with the botanical dyeing process is with the same frame of mind that one would approach nature.