small opening behind a wall, around a window, or near a repair, foam can occasionally protrude through a gap. Once exposed to air, it can become quite hard and may look surprisingly unlike the soft foam people associate with the product.
Some construction foams can also change appearance as they age or are exposed to light and the surrounding environment.
So if the mysterious pink material is firm, lightweight, foam-like, and emerging from a crack or hole, construction material should be on the list of possibilities.
But if the material
