Heritage Science

Table 2 Visual observations and spot test results of the fibre based matt test photographs before and after artificial ageing

From: A study of the relationship between the migration of image silver and perceived yellowing of silver gelatine photographs

Sample	Visual observations^a			Spot tests
Sample	Border	Image	Verso	Silver	Residual fixer (thiosulfate)
Well processed un-aged	Imperceptible	Imperceptible	Imperceptible	No	Slight [2]
Well processed aged 50 °C and 70% RH	Imperceptible	Imperceptible	Barely perceptible	No	Slight [2]
Well processed aged 50 °C and 90% RH	Slight	Heavy	Slight	No	Slight [2]
Insufficiently washed un-aged	Barely perceptible	Barely perceptible	Moderate	Perceptible	Heavy [4]
Insufficiently washed aged 50 °C and 70% RH	Moderate	Heavy	Heavy	No	Heavy [4]
Insufficiently washed aged 50 °C and 90% RH	Heavy	Slight	Heavy	No	Slight [2]

^aPerformed according to the scheme by Honda as described in the “Methods” section

Back to article page