barefootliamhttps://www.fromoldbooks.org/Rouam-MuseeArtistiqueV/pages/306-angel-announcing-christmas/
The firm of Yves & Barret in Paris developed a #photoengraving technique drawing on zinc and then dusting it with resin that stuck to the ink, then using acid to etch away the zinc elsewhere to make a printing block.
Here an #angel is blowing a #trumpet to announce #christmas and the invention of the #hashtag.
First from this book, vol. 5 of a series. I also have vols 4 and 6, picked up cheaply on a business trip years ago.
Jon Bosak