Paper, 'Some experiments and observations on a new substance which becomes a violet colored gas by heat' by Sir H [Humphry] Davy Subject: Chemistry Published in Philosophical Transactions as 'Some experiments and observations on a new substance which becomes a violet coloured gas by heat'. Written by Davy in Paris. Read 20 January 1814. Abstract published in Abstracts of the Papers Printed in the Philosophical Transactions of the Royal Society of London [later Proceedings of the Royal Society of London], Volume 1, 1832. 10 December 1813