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.
Introduction to iodine test for starch. Starch is a polysaccharide which is found in cereals like rice and in tubers like potato. Iodine test for starch the most followed method to analyze the presence of starch in the given food material. When iodine solution is mixed with starch it turns from brown to dark blue.