Color of the Day - Raymond blue

Raymond blue, 1811 – the Process for dying Silk of a Prussian Blue. By M. Raymond. Published by the Government in 1811. …the blue obtained by prussiate of iron, otherwise termed Raymond’s blues, are at least as brilliant, …as in blues which are produced with the sulphuric solution of indigo, and known by the name of composition blues; and they have this advantage over the latter, that they are much more beautiful, and at the same time more solid.
Repertory of Arts, August 1815

excerpt from:
Elephant's Breath and London Smoke
edited by Deb Salisbury
Available at www.Mantua-Maker.com