Instead of arguing over whether paint sticks to ice and dragging in seal hunting, let's look at the credentials of the Prinz Adalbert photo. It's usually claimed to have been taken on 15 April in the vicinity of the sinking. However, I have news on that.
The captain of Prinz Adalbert provided a statement to his owners, who passed in on to the Board of Trade. It's dated 29 June 1912.
It shows that Prinz Adalbert was not on the scene of the sinking on 15 April. Her captain reported that he was warned of ice by Caronia on 14 April. He proceeded on his course of 259 True until he met his first iceberg at 3-30am on 16 April, in 42.03N, 48.57W. He proceeded very slowly and by 8-00am he could see a huge icefield extending north and south. He steered various courses to clear it and eventually got clear in 41.37N, 50.14W.
By 16 April, the fatal berg was far from the scene of the wreck. To find it by chance is stretching credibility more than a little.
The report makes no mention of the berg in the photo. It is impossible to believe that those on Prinz Adalbert were unaware of the sinking, as is sometimes claimed. On the morning of 15 April, Gilbert Balfour, on Baltic, complained that her operator was constantly interrupting traffic relating to Titanic.
The story has the appearance of a sailor's yarn. The dark line along the berg's base is obviously the shadow of a little overhang, caused by water lapping on the berg. The diagonal dark line has every appearance of a dark layer of ice. These are sometimes seen, having been created by some event during the many years in which the ice was laid down.
There are at least eight photos that claim to show the berg that dunnit. Some have far better credentials, having been taken near the wreck site on 15 April. A notable example was taken by an officer of Birma. None would be convicted in a court.