Gerald C Koch
Member
On the contrary, yellowing is common. See these for example:
An excerpt from the last one:
"...varnishes have other drawbacks too. One problem is that over time, they tend to yellow..."In "The Print," Adams cautions that, while there are advantages to varnishing prints, adverse effects on archival qualities are of concern.
None of the articles cited really apply to what AA described. The key here is in the amount of varnish applied. Obviously if you paint it on there will be problems. However the lithographer's varnish is diluted with a much larger volume of solvent. This is applied sparingly to the print and immediately wiped off. Wiping with a clean cloth continues until no varnish is visible. We're talking about a coating a few molecules thick. As I said the amount is so small that even if it should yellow you would never be able to see it. From my own experience there is no yellowing even after decades nor was there any other effects visible. The advantage of using the technique is an increase in contrast and an increase in the Dmax of the darker blackss.
Your concern is appreciated but does no seem to apply to the AA technique. Now other s may have done things incorrectly and experienced problems.
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