This test was seriously confounded by several uncontrolled factors:
1. The way I read it, the unmounted samples were not placed in the oven, so all that was compared was aluminum vs dibond, with no actual control; you cannot determine how aluminum and dibond differed from standard mounting.
2. The bonding agent also was not applied to the "unmounted" samples which presumably were the controls, thus you cannot separate differences due to the bonding from effects due to the backing.
3. All of the observations were qualitative so if there was any variation between the samples the significance of the differences cannot be tested statistically.
4. Because the dibond has a relatively non-conducting layer, the "effective" heat of the dibond may have been higher, while the aluminum could radiate some of the heat (which is consistent with the results, but may not be applicable at normal temperatures).
5. This experiment tested only the physical damage to the papers, not impacts to the inks such as relative color changes.
6. "Aging" is determined by multiple factors such as UV exposure, air borne contaminants and acidity, which were not tested, so this is a very narrow definition of ageing and limits the applicability of the study.
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Richard Eskin
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