imageHugh writes in Might tactile chemography prove to be the super-model?:

Some people think that the “effects of aging” are that an originally bright clear image has faded/flaked to what it is now; and others that an originally completely invisible image became visible by darkening – those who habitually place their experiments in an oven for “aging.” We need to be clear about what “aging” really does.

What happens to non-modern linen bleached by different methods, over time under many different conditions: light, temperature both normal and extreme, moisture, natural radiation, all manner of pollutants in the air or in reliquaries and so forth.

There are the questions: do some or all of these things act differently on “imaged” fibers and non-imaged fibers?  How does age act on banding, whatever that is, because it has a visual affect on the image. In fact, is banding a symptom of aging? Why?