London's Tate Modern unveiled a huge, spectacular abstract painting by acclaimed US artist Joan Mitchell on Thursday, part of one of the "most significant gifts" to the gallery in recent decades.

British art collectors have been urged to engage in more charitable giving after a multi-million pound painting donated by an American tycoon and his wife was unveiled at the Tate Modern.

LONDON (AP) — Britain’s Tate Modern art museum on Thursday unveiled one of the most significant gifts it has received in years – a masterpiece by an American abstract expressionist that hung ...

LONDON (AP) — Britain’s Tate Modern art museum on Thursday unveiled one of the most significant gifts it has received in years – a masterpiece by an American abstract expressionist that hung ...