Do pen inks expire?

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If you're anything like the other people who use fountain pens, you probably have more ink than you could ever use in your whole life. And why on earth not? Because there are so many fantastic inks available to use these days, it would be almost hard not to purchase a new bottle every now and again. Because there is so much ink, there is cause for alarm among a great number of individuals. Does ink have a shelf life? This gives rise to other questions. How long may ink be stored before it becomes contaminated and unsafe to use? What are some signs that the ink has lost its quality? All of these are topics that will be discussed in depth in this essay.
What exactly is ink?

Before going any further, it would be beneficial to have a basic understanding of what ink is. The fundamental component in ink is distilled water. Depending on the kind of ink we're discussing, the color in the ink originates from either pigments or dyes. Dye-based inks are also an option. In spite of this, a bottle of ink contains more than simply water and color by itself.
Have you ever taken the time to observe that water has a lower viscosity compared to ink? When you next clean your fountain pen, fill it with water and hold it with the nib pointing down. This will ensure that all of the ink is removed. Some pens may begin leaking water after they have been used for a while. To our great relief, this does not occur while using ink. Because of this, ink contains a surfactant that makes it more viscous and raises its surface tension in order to prevent it from leaking out of pens.
Ink, in addition to containing a number of other components, also includes compounds that are antibacterial. These are designed to inhibit the development of germs that, if they were to get into your pen, would wreak havoc and have the ability to infect and ruin several fountain pens!
Keeping ink bottles in the box they came in is an effective way to shield the ink inside from exposure to light.
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