Currently Naviera Quimica has become more active again with their (second hand) ships fitted with the prefix NQ, but in the past their fleet of small chemical tankers was quite a regular in the North Sea area. Here is the Fosforico, (Ruiz de Velasco, 1969#104) on her way to see, early eigthies.
She was sold out of the fleet in 2000, after which she a varying career as water tanker and then again Chemical tanker. As Crystalwater, she is still with us today.