Fig. 7.

Test papers from left to right: sample at 0 week, sample at 2 weeks, sample at 4 weeks, sample with 2.5E-2 mg/mL iodine, sample with 2.5E-1 mg/mL iodine, sample with 5E-1 mg/mL iodine, and sample with 1 mg/mL iodine