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.
To test an unknown substance for starch, you first need to dissolve 10 grams (0.35 ounces) of potassium iodide and 5 grams (0.18 ounces) of iodine in 100 milliliters (3.4 fluid ounces) of water. Place a few drops of the mixture on any items that you want to test for starch. The solution will change color in the presence of starch. Some items to try are potatoes, meat, rice, flour, wood, and apples or pears. Some contain starch and some do not.