A dye exclusion test (DET) was performed to determine the viability of human breast cancer cells MCF-7. using natural food pigments as compared with trypan blue (TB). a typical synthetic dye for DET known to exhibit teratogenicity and cytotoxicity. We demonstrated that Monascus pigment (MP) is noninvasive to living cells and can effectively stain only dead cells. https://cuttingedgecutleryco.shop/product-category/cane/