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.
For Demo #5 (student experiment): Make 500mL of 0.0125% of starch solution in water (1:10 dilution of 0.125% starch stock solution). Add 200uL of iodine indicator, and stir. Aliquot 5mL of this solution into 3 reaction tubes per student pair (I.e. if you have 10 student pairs you will need 30 tubes.