South African painting discovered in use as a kitchen noticeboard valued at £1m

Arab in Black by Irma Stern, which was donated to fund Nelson Mandela’s legal defence in the 1950s, found covered in bills and letters in a London flatAn art expert has spotted a painting valued at up to £1m, which was once sold to help fund Nelson Mandela’s legal defence, being used as a noticeboard in a London flat.The painting, Arab in Black, a 1939 work by Irma Stern – regarded as South Africa’s leading artist, whose works have recently been soaring in value – was recognised