Re: Litho: acidic fountain solution and longevity
yes... even a slight acidity will have an effect on the longevity of the paper. Over 50 years or so, it will slowly attack the paper, turning it brown. Eventually it will cause it to crumble. I've got a ton of materials I printed in the 1960's. and it's all turning brown.
The simple solution is to not use an acid fountain. IF, and that's a big IF, the acid is only used to prevent scumming, then simply don't use it.... just be prepared to toss the solution before it goes bad. However, acid is also used to gain a bit more resistance to the ink, and to help it spread across the plate evenly so not using it may or may not cause a problem, depending on your ink, the plate and your water. Since I've not used poly plates for litho (I'm a stone guy) I'm not sure how vital the acid is.
What I'd do is make a test using the fountain without acid. If it works, then just leave the acid out when doing your prints. You may also want to try using a little baking soda instead of acid.
If that fails, and you must use acid, all is not lost. Tallas sells an acid neutralizing spray, or you can make your own using a spray bottle and soda. Just mist it onto the surface and let it dry. Prints treated that way last a long, long time.
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