Yikes! No wonder you responded the way you did to my post about the 6 hour mash. What is iodine reacting with to cause a false positive if not unconverted starch?
As a side note, I do little mini mashes on the kitchen stove for my yeast starters. One time I was getting false positives from some starchy deposit on the plate I was using for the sample test. That makes you slap your forehead.