The DFDS funnel symbols
For the first 100 years DFDS had its funnel symbol from Koch & Henderson: a black funnel with a red band across the middle. The black and red funnel was a well-known sight on the high seas.

As time went by several shipping companies worldwide used the same funnel colors, and this caused confusion.
From 1 January 1967 it was decided to add the white cross in a blue circle placed in the middle of the red band. Up until 1982 this funnel symbol was used on both passenger ships and freight ships.
In 1985 it was decided that all DFDS passenger ships should be painted white with the white cross and "racing stripes" in three shades of blue on the funnel and hull. This decision was inspired by Scandinavian World Cruises' logo on m.s. SCANDINAVIA. Since then DFDS passenger ships have borne this symbol.
Up until 1992 the freight ships had a the black and red funnel with the white cross in the red band. The funnel decoration was then changed to a dark blue with the white cross encircled by a white line.
DFDS Tor Line's original funnel color was white with a large O over two blue wavy lines. This was also changed in 1992 to the dark blue funnel with the white cross.
Today the funnels on passenger ships are white with the white cross on a blue circle background and three stripes in three shades of blue. Freight ships have DFDS blue funnels with the white cross encircled by a white line.
From 2010 all ships has DFDS blue funnels with the white cross encircled by a white line.