This mystery medieval calendar has been in the Royal Society's archive for about 350 years, simply labeled 'a very curious almanack' Join us for the restoration and discover the secrets hidden in its (sometimes poisonous!) pigments. #restoration #chemistry #history #medieval Watch next: A modern physicist critiques John Evelyn's 1661 book on air pollution ▶ https://www.youtube.com/watch?v=adJ0tTpSqNE Find out more with about our almanac on https://www.youtube.com/channel/UCGn7dlcAmH44GqycKa_3ssA https://artsandculture.google.com/story/6QVxDXpcN2LcMQ Read our blog about the pigments found on the manuscript: https://royalsociety.org/blog/2023/01/colours-of-the-seasons/ Conservation carried out with the support of the National Manuscripts Conservation Trust Thanks to 'Team Pigment' members Professor Andrew Beeby, Professor Richard Gameson (Durham University) and Kate Nicholson (Northumbria University), and to Sayaka Fukada, book and paper conservator. Watch next: A modern physicist critiques John Evelyn's 1661 book on air pollution ▶ https://www.youtube.com/watch?v=adJ0tTpSqNE The Royal Society is a Fellowship of many of the world's most eminent scientists and is the oldest scientific academy in continuous existence. ▶https://royalsociety.org/ Subscribe to our channel for exciting science videos and live events, many hosted by Brian Cox, our Professor for Public Engagement: https://bit.ly/3fQIFXB We’re also on Twitter ▶ https://twitter.com/royalsociety Facebook ▶ https://www.facebook.com/theroyalsociety/ Instagram ▶ https://www.instagram.com/theroyalsociety/ And LinkedIn ▶ https://www.linkedin.com/company/the-royal-society