Reader Brenton wrote in with this comment:
Just a comment, Ruby Lithographic film works just fine for Becquerel, it can be obtained from any good printers as it is used in the production of the plates.
Please see my new site www.daguerreotypes.co.uk
regards,
Brenton
It’s good to know that the Rubylith works; I thought that it might. I found some generic stuff at my local art supply store in Raleigh that seems to work fine. Thanks for writing in, Brenton.
Every time I start to fret about the materials or supplies that I’m working with (tap water, generic amberlith, polishing compounds of questionable provenance purchased from eBay) I am comforted by the thought that Daguerre and his contemporaries suffered with substandard supplies and made perfectly fine images.