Old photos on Objectivity: https://youtu.be/9Xt55LyX5pU Silver Nitrate into a solution containing halides. Also some talk about photography and cloud seeding. Discussed by Professor Sir Martyn Poliakoff. Dr Samantha Tang did the experiments for us. Silver on Periodic Videos: https://youtu.be/pPd5qAb4J50 Gun Cotton: https://youtu.be/38w2-NCdtio Support us on Patreon: https://www.patreon.com/periodicvideos More chemistry at http://www.periodicvideos.com/ Follow us on Facebook at http://www.facebook.com/periodicvideos And on Twitter at http://twitter.com/periodicvideos From the School of Chemistry at The University of Nottingham: http://bit.ly/NottChem Periodic Videos films are by video journalist Brady Haran: http://www.bradyharan.com/ Brady's Blog: http://www.bradyharanblog.com Join Brady's mailing list for updates and extra stuff --- http://eepurl.com/YdjL9