About merchant ship wartime colours

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@ kapuhy I have finally found the B/W originals of the "suspect" pictures you had posted before.



From Wikimedia Commons:

Description An Atlantic convoy underway as seen from a Royal Air Force Short Sunderland flying boat.
Date circa 1943
Source Dennis Richards and Hilary St. George Saunders: Royal Air Force 1939–1945. Volume II: The Fight Avails; London, HMSO, 1953. Photo [1]
Author Unknown author

It is hard to say from this picture as shadows might milead our eyes, but yes, several ships in the picture above seem to have black hulls and bright supestructures.
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from the Russia in Estonia Twitter profile:

The 31st of August 1941, 7 ships of the USSR allies in the war with Nazi Germany reached the port of Arkhangelsk. This convoy under the code name "Dervish" was the first to supply the USSR with military equipment and armaments according to the lendlease programme.

The central ship has black hull and a dark-painted funnel with three brighter bands. According to Wikipedia, Operation Dervish convoy was composed of the following merchant ships:

Lancastrian Prince, owned by Prince Line (Furnes, Withy & Co.)
New Westminster City, owned by Reardon Smith Line
Esneh, owned by Moss Hutchinson Line
Trehata, owned by Hain Steamship Co.
Llanstephan Castle, owned by Union Castle Line
Alchiba, owned by Van Nievelt, Goudriaan & Co.

Add to them RFA Aldersdale (Admiralty-owned fleet oiler). Discarding for obvious reasons the latter, a quick internet research tells me that neither of the above shipping copanies used a similar funnel pattern. The attribution might be wrong, or further research might be required, nonetheless the fact remains: that looks lika a war convoy, and at least one of the ships composing it is not painted grey