- 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
- '724 + 716 mixed' [in Herschel's hand].
- Physical material
- Paper
- Dimensions
- Height: 132mm Width: 104mm
- Inventory No
- 28492
- Accession Number
- 1928-71
Description
Experimental photogenic drawing (cyanotype) by Sir John Herschel, undated, c.1842, made in the course of the experiments in which he invented the cyanotype.
Subject: engraving, lady outdoors holding book on her knee
Technique: contact copy (print) from a negative???
Format: vertical
Polarity: positive
Orientation: correct???
Quality: good detail, too dark in places???
Colour: dark blue with very dark darks and pale blue lights, uneven pale blue to natural border, rusty stain, plain back with slight blue stains
Chemistry: cyanotype, Herschel's numbers indicate two sensitising mixtures mixed, 716 being ammonio-tartrate of iron (see 48235)
Coating: none
Inscription: numbers
Paper: normal
Condition: good
Purpose: a cyanotype experiment.
For fuller descriptive and historical commentary see narratives.
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