Tigerino Special Care â White Intense Blue Signal is a hygienic clumping cat litter with special, patented “Blue Signal” grains. The white grains turn dark blue on contact with urine. These blue coloured clumps are highly visible, so it is easy to remove just soiled litter, ensuring an economical and efficient use of litter. Aromaguardâ¢ technology provides antibacterial protection and actively prevents bacteria and nasty odours from forming. Your cat’s litter tray will stay fresh for six times longer when you use Tigerino Special Care â White Intense. Tigerino Special Care â White Intense Blue Signal cat litter at a glance: Bright white clumping litter with a pleasant, fresh scent With blue signal grains, which turn blue on contact with urine Stays 6 times longer fresh compared to traditional litter With Aromaguardâ¢ technology for antibacterial protection Very fine natural clay granules Extremely economical Instant and powerful clumping action 99% dust-free (less than 1% dust) Tigerino Special Care with Blue Signal is especially fine-grained and rapidly forms into clumps. Remove soiled clumps regularly to keep the litter hygienic and fresh smelling.