The Iodine Test Paper detects Iodine in solutions in increments of 0, 12.5, 25, & 50 ppm. Disinfection with Iodine occurs between 12.5 ppm and 25ppm. This is an older method for sanitizing utensils and dishware used in the restaurant trade. Iodine test paper used in chemical analyses to measure iodine levels in solutions, such as in titration experiments and iodometric assays and can also check iodine potency in medical and biological samples.