This is a drop of 1-heptanol at 60.0°C on 19.7°C (R.T.) water. This drop, upon contact with the water’s surface, immediately spreads out to a much larger circular shape. In the middle of the circle the liquid is lighter, indicating the center is thinner relative to the rim of the drop. After ˜ 0.27 seconds the thin membrane in the middle of the drop begins to break apart, forming voids. Eventually the voids encompass the entire center of the circle and a hollow ring-like shape remains. This ring shape then breaks into many smaller drops and dissolution occurs as usual.