Very first time I took Lugol's I noticed that the drop from Lugol's seemed bigger than Dr. Clark's Iodine bottle. So I took a small flat plate and dropped one drop of Iodine from each bottle from the same height, about an inch from the plate surface. I am not a scientist or a mathematician, but Lugol's drop looked slightly bigger in diameter than Dr. Clark's Iodine. Another difference was that Lugol's was darker than Dr. Clark's Iodine.
Yes, I have tried ACV for my reflux it di not help much.
Archus