- Subject
- Photography
- Item type
- Object
- Makers
- John Herschel
- Provenance
- Presented by Miss Herschel and Lady Lubbock in 1928. They were the two surviving and youngest children of Sir John Herschel (Francisca and Constance).
- Primary inscriptions
- 'ACl'.
- Physical material
- Paper
- Dimensions
- Height: 126mm Width: 98mm
- Inventory No
- 23855
- Accession Number
- 1928-71
Description
Experimental photogenic drawing (direct positive cyanotype) by Sir John Herschel, undated, c.1842. The surprising blue and green effect is a characteristic of one of the experimental variants of the cyanotype that produced a direct positive image.
Subject: engraving, lady with harp
Technique: direct-positive contact copy
Format: vertical
Polarity: positive
Orientation: laterally reversed
Quality: good in dark areas, no clean highlights
Colour: dark blue, green border, plain back
Chemistry: direct positive cyanotype, using ?ferric ammonium citrate as sensitising agent
Coating: none
Inscription: chemical note
Paper: normal or thinnish
Condition: good
Purpose: a cyanotype experiment using a variant process that produced a direct positive image.
For fuller descriptive and historical commentary see narratives.
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