Iodine- What it can do

Iodine is commonly used in Science Laboratories for various experiments, as it has a good use. It comes in many forms, small crystals, liquid, or even the raw form (chunk of crystal). Iodine can detect if there is starch in a substance when it is applied onto it. It reacts with starch and turns blue-black when put together with starch. If the iodine solution turns dark blue, it represents that starch is detected in the substance. If if does not change its colour and remains brown, it means that starch is not present. Take for example a biscuit, as shown in the picture above. When iodine is applied on it, the solutions turns dark blue at once, meaning that starch is present in the biscuit. However, if iodine is applied onto a piece of fish meat, the colour of the iodine solution will not change and will remain brown, as starch is not present in fish meat. Starch is only present in plant products (flour, potatoes, bread, etc.), and is not present in meat or other products (chicken, plastic, metal, etc.), which means that iodine will
only react and turn blue-black when it comes into contact
with plant products.