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When iodine is added to cornstarch, a blue-black complex is formed. This is utilized as a simple test to detect the presence of starch in a given substance.
the mixture turns black
If you mean to test for starch then Iodine
Blue or Purple
Mixing iodine with cornstarch does not result in a chemical reaction. Instead, it forms a physical mixture in which the iodine molecules become trapped within the starch molecules, causing the mixture to change color. The iodine acts as an indicator of the presence of starch.
One way to test if a powder is talc or cornstarch is by performing a iodine test. Mix the powder with iodine solution; if the mixture turns blue-black, it is likely cornstarch. Another way is to do a simple solubility test: dissolve the powder in water and if it is talc, it will not dissolve and settle to the bottom, while cornstarch will dissolve.
Blue color
Iodine does not react with baby powder. Baby powder is usually made of talc or cornstarch, which are inert substances and do not participate in chemical reactions with iodine.
You can test for starch in general using the chemical iodine test. If starch is present, a solution of iodine (I2) turns blue-black.
When cornstarch is mixed with iodine, a process called iodine starch complex formation occurs. This reaction turns the mixture dark purple because the iodine molecules interact with the starch molecules and form a specific type of complex that absorbs light in the visible spectrum, giving it a purple color.
Potato, cornstarch, rice, or bread can turn blue-black with iodine solution due to the presence of starch.
Iodine is used to test for starch; when the two are combined a deep bluish-black color is produced. This is a result of the intensely colored I3- ion forming inside the helices of the amylose regions in the starch.