Table 4 Visual observations and spot test results of the historical photographs
Sample name and date | Visual observationsa | Spot tests | ||||
|---|---|---|---|---|---|---|
Border | Image | Verso | Comments image | Silver test | Residual fixer (thiosulfate) | |
“Street scene” (S) early 20th century on cream fibre based matt paper | Moderate | Moderate | Moderate | Yellowed in highlights and mid tones. Neutral grey in shadows. Mirroring on shadow areas | No | No |
“Ceremony” (C) 20th century on cream fibre based glossy paper | Slight | Moderate | Moderate | Image is chocolate brown hue throughout: thought to be yellowing | Perceptible | Heavy [4] |
“Aeroplane” (A) 29/10/1945 on off white fibre based glossy paper | Barely perceptible | Barely perceptible | Barely perceptible | Barely perceptible | Slight [2] | |
“Crumpled manuscript” (CM) 14/03/1963 on white (OBA) fibre based glossy paper | Imperceptible | Imperceptible | Barely perceptible | No | Barely perceptible [1] | |