run something into something. 1. to guide or route something, such as a wire or a pipe, into something or a place. The worker ran the circuit into each room. He ran in the circuit as specified. 2. to guide something into something; to drive or steer something into something else.
A change of color to a blue-black or purple color suggests that starch is present. If there is no change in color, this suggests no starch is detectable. Note the change of the iodine to black on the potato (right) but not the apple (left). (10% Tincture of iodine.) Potato contains starch, but apple does not.
2of2. 7 th LAB Sugar, Protein, and Complex Carbohydrate Tests Food Test 3: Complex Carbohydrate (starch) â Iodine solution Iodine solution is used to test for the presence of complex carbohydrates.Iodine is a yellowish liquid that turns dark purple or black when it reacts with complex carbohydrates.omplex carbohydrates are very large energy rich organic molecules that contain carbon hydrogen and oxygen. Many sugar molecules chained together would form a complex carbohydrate. 1. Apply a drop of iodine directly to each food sample. 2. Note any color change. Starch will turn iodine dark purple or black.