Conosciamo l'Inchiostro Ferro-Gallico! - Dalle Galle al Pennino

Today we will get to know ferro-gallic ink and how it is obtained from galls, particular excrescences that form on plants in reaction to irritation caused by foreign organisms, such as insects. . [Enne]. . . . Key moments: 0:00 Intro 0:22 Historical Excursus 1:02 How was ferro-gallic ink obtained in the past? 1:49 What are galls? 2:48 What is tannic acid? 3:29 Let's make ink! 5:25 Why is it not used any more? 6:37 Outro and Acknowledgements . . . Photo references: 1) carbon photo - Photo by FK1954 - Own work, https://commons.wikimedia.org/wiki/Fi... . 2) photo Cynips quercusfolii - File Upload by Bot (Sarefo), https://commons.wikimedia.org/wiki/Fi... . . . Literature and insights: 1) https://scienceinschool.org/it/articl... Really well done article from which I took information and the procedure for extracting gallic acid from galls. . 2) Handouts from the 'Chemistry of Materials' course at the University of Milan . 3) H. Wilson, Analysis of the current research into the chemistry of Iron Gall Ink and its implications for Paper Conservation . 4) A. Ponce, L. Brostoff, S. Gallant, P. Y. Zavalij, Elucidation of the Fe(III) Gallate Structure in Historical Iron Gall Ink - DOI: 10.1021/acs.analchem.6b00088 This is a more technical article where they study alternative iron gall ink structures. As I said in the video, the exact structure is still a matter of debate. In fact, it is thought that ferric bis-gallate undergoes a decarboxylation of the gallate ligands in the presence of free Fe(III) ions, leading to the formation of ferric pyrogallate, a black solid insoluble in water. . . . Music: Highball (prod. by Lukrembo) . . . Our socials: Instagram:   / fitosophy_   YouTube: @fitosophy_ Linktree: https://linktr.ee/Fitosophy . . . #fitosophy #followourfitosophy #galle #inchiostro #inchiostroferrogallico #divulgazionescientifica #divulgazione