Heritage Science

Table 3 The maximum, minimum and average number of colloidal silver particles found in TEM images of test fibre based matt photographs processed and aged differently

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

Sample	Maximum^a	Minimum^a	Average^a
Well processed un-aged	8	6	4^b
Well processed aged 50/70	208	9	27^c
Well processed aged 50/90	826	124	257^c
Insufficiently washed un-aged	26	14	10^d
Insufficiently washed aged 50/70	11	1	3^c
Insufficiently washed aged 50/90	6	0	1^c

^aRelates to number of colloidal silver particles, defined as having a diameter of 0–25 nm
^bAverage of 3 values
^cAverage of 9 values
^dAverage of 2 values

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