This experiment was meant to test the selective permeability of dialysis tubing to iodine, glucose, and starch. In the experiment it was discovered that tubing is permeable by iodine and glucose but not starch. This is known because the bag acting as a membrane turned blue black ( a reaction between the iodine and starch) and the solution remained an amber color. This indicates that while the glucose and starch were able to move through into the solution the starch could not as the color changing reaction didn't occur outside of membrane.