Note 20 — Chapter VIII
Reading edition
For a more detailed account of the toning process by Sulphur, see the Third Section of this Chapter, page 145. The instability of sulphuretted prints is shown in the fourth Section.
Reading edition
For a more detailed account of the toning process by Sulphur, see the Third Section of this Chapter, page 145. The instability of sulphuretted prints is shown in the fourth Section.