I don’t have problems with them drying up. But they are not archive safe and apparently will fade out in time - my Japanese friends warn me that in time I am going to lose my notes.
Maybe they’re talking about lightfastness, which is resistance to fading in light.
This is usually more of an issue when drawing or painting, and many cheap colored pencils for example will simply disappear if you keep them on the fridge too long. I don’t think any normal pen ink has this issue. But then again, this isn’t a normal pen, so…
That said, if they do fade, I’d be surprised if Pilot doesn’t clearly specify this somewhere.
In some cases refrigerating the ink will make it visible again, but not reliably. Leaving notes in your car can cause then to be erased. So these are a novelty or for casual use.
A fantastic use case though is in sewing. Ironing the fabric makes the ink transparent. These pens are far superior to chalk for that reason.
My understanding is that they are telling me it’ll irreversibly lose color over time. But I have 5 and 10 year old notes that are still fine, so I’m not sure I believe that.
Pilot also updates the formula so a frixion bought today has much better colors than one bought 10 years ago
This is usually more of an issue when drawing or painting, and many cheap colored pencils for example will simply disappear if you keep them on the fridge too long. I don’t think any normal pen ink has this issue. But then again, this isn’t a normal pen, so…
That said, if they do fade, I’d be surprised if Pilot doesn’t clearly specify this somewhere.