what i found illuminating was to read through the ' Liver Flush - documenting health effects' forum. many stones were indeed analyzed. some labs found the stones to be gallstones, some found them not to be. (the green ones are liver stones , and i don't believe they should test positive for being gallstones. the tan ones are gallstones.) i can't tell you what the difference in the labs testing was, why some came out positive and some didn't. but enough positive lab tests & reading peoples experiences have convinced me.