Jakob, we are not trying to determine what causes the fading, we know that many inks (and paints) fade. The goal is only to see which inks will fade faster / slower. The ozone is likely the same in the room where I store my notebook, as it is where I have my window. We don't need - for these projects - to know what causes the degradation, only which inks will be a better choice for Charles.
In order to know if this 3 Oysters Mustard ink will work for Charles, you need to know the variables that may cause that ink to fade faster or slower and if they are present/absent in significant amounts in the environment he is keeping/writing his journals in.
The nature of journals is that they will likely sit closed more than opened, and UV light is not going to be a significant factor in any fading of the ink therein. The main variables that will effect the fading of ink in a closed journal will be ozone, acidity of the paper and/or ink, either initially or concentrated and created over time through interactions with other air pollutants, humidity, and temperature.
Certainly, because UV and ozone are oxidizers, an ink that fades by one process, could fade by the other, but this will be done at diffferent rates, and or not at all depending on the environment Charles lives in. In other words, if ozone and other air pollutants are not significantly present in Charles's environment, he may never see any fading of the ink in a time that is acceptable to him, or ever. Thus, though an ink may fade in a UV fade test by UV and any other unknown variable, it will not be exposed to those variables (ozone,air pollution, acidity, temp, humidity) in concentrations that can cause it to fade in a closed journal.
Charles can't make the best decision about using the ink he wants to if he doesn't know what in his environment will cause the ink to fade faster or slower in a closed journal, and UV fade tests are simply not structured to do this in a meaningful way.....
Charles, If you do want to go ahead and use 3Oysters Mustard for your journal writing, and want to find out what the ozone and other air pollution levels are in your neck of the woods, you can find so by going to either the ALS website, and type in your zip code in the box on the left, or the AIrNow.gov and do the same in the box in the top right.
If you do find you live in an area of high ozone and other air pollution levels, there are a few things you can do to remove them from the area where you store your journals. One way, is to use a MicroChamber Book Phase Box, which is made to remove pollution and deterioration byproducts before interacting with the enclosed book/journal. This would be a great option for your journal collection no matter the type of ink used, as it will limit paper deterioration as well. The second, is to use a activated carbon filter either through your furnace, or a dedicated activated carbon air filter. The dedicated air filter will remove ozone and other gas based air pollution quicker and more regularly, they can be reasonably affordable to pricey depending on what features they have. You can also line whatever you store your journals in with activated carbon cloth (just one place you can find it) which can absorb gas pollutants such as ozone before they interact with your writings. Both MicroChamber board, and activated carbon cloth also can be used for those of us who have large collections of vintage plastic pens that are prone to off gassing, capturing these gasses before they interact with vulnerable pens. Even if you live in a low ozone or other air pollution level area, these options might be good just as a precaution, as other environmental events such as wildfires, or a long term increase in daily temperature may form higher levels at some point down the road.
Edited by JakobS, 25 April 2019 - 17:45.
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