Add iodine solution to the food being tested. Foods containing starch will turn a blue-black colour. The iodine test can also be used with a microscope to stain starch grains in plant cells.

While a pap smear test costs Rs 250 per person, the vinegar-iodine test can be done for less than Rs 50.However,though doctors agree it is a cost-effective way of screening, they feel it is not ...

Add iodine solution to the food being tested. Foods containing starch will turn a blue-black colour. The iodine test can also be used with a microscope to stain starch grains in plant cells.

"The iodine test is popular because it's quick and accessible â it detects the presence of starch by turning blue-black. But in reality, that's a very limited lens to judge paneer.

3. Iodine Solution Test The iodine test is a simple yet effective way to detect starch in paneer. Dissolve a small piece of paneer in water, then add a few drops of iodine solution.