BB is generally considered a non-toxic dye and is already used for staining numerous brands of candies, soft beverages (including popular brands such as Gatorade), alcoholic drinks (Blue curaçao liqueur), and cosmetic requisites such as mouthwash or after-shave products al., 2013). Studies on animal models showed that BB did not present fetal toxicity when applied orally , and its absorption in the intestines was about 0.27%. Most of the uptaken dye was removed from the organism with urine . In our tests, BB also appeared biocompatible and non-hazardous to human cells (Supporting Information).