An artwork displayed at a National Trust property and seen by thousands of visitors each year has been identified as a rare surviving work by a printmaker credited with inventing colour printing. It had always been assumed that the copy of the Sir Anthony van Dyck portrait, the Three Eldest Children of King Charles I, displayed at Oxburgh Hall in Norfolk was oil on paper.
https://www.standard.co.uk/news/uk/national-trust-charles-i-norfolk-knole-german-b1155977.html