HiCromeâ„¢ UTI Agar, Modified facilitates and expedites the identification of some gram-negative bacteria and some gram-positive bacteria on the basis of different contrasted colony colours produced by reactions of genus or species specific enzymes with two chromogenic substrates. HiCromeâ„¢ UTI HiCynthâ„¢ Agar, Modified is prepared by completely replacing animal or vegetable based peptones with chemically defined peptones to avoid BSE/TSE and GMO risks associated with vegetable peptones.