These charts may help the more serious breeders.       Blue Tiger Grades   Black Tiger Grades https://web.archive.org/web/20141015120418/http://garnelenbox.de/tiere/schwarze-tiger-grades.html   CRS/CBS Grades   German color K system for crystals https://translate.google.com/translate?sl=auto&tl=en&js=y&prev=_t&hl=en&ie=UTF-8&u=http%3A%2F%2Fcrystal-red.de%2Faussehen.htm&edit-text=&act=url   more crs grading charts http://crystalred.xc.ro/en/cry