The photos you see up top and below are quite possibly the only known photographic evidence of the actual iceberg that was struck by the Titanic. Understandably, nobody had bothered to snap any photographs while the ship was actually sinking, so it’s impossible to make an absolutely confirmed positive identification. But both photographs feature the telltale sign of a collision with a ship, and likely a recent one at that: a streak of red paint.
For a detailed explanation, visit the source below.
Source: [io9]