I recently discovered a pack of ballpoint pens I had bought at a "dollar store" and realized it must have been a few years since I had bought them. I have had mixed success with ballpoint pens, no matter where I bought them, probably because I have, generally, bought the cheapest available, wherever I got the impulse to buy them. Some have worked great and lasted over a year and some didn't fare so well.
I realized, in this instance, shelf life would be a determining factor in their performance. In particular, if I bought them at a dollar store -- one can never know why they ended up there in the first place -- maybe near the end of their shelf life. More likely, not, though, given the source and price for these items.
Now, I wanted to know what the shelf life is. I searched for quite a while before finding a statement from a poster in some forum that it is typically 2-4 years. Such a broad range!? The poster provided no reference or data to substantiate the comment. More commonly their "life" is gauged as the number of linear feet they will write before failing. These figures, typically thousands of feet, are interesting when one considers the size of the reservoir for the ink. I had to wonder how that is arrived at. Is it extrapolated from some short-term testing? And does the test try to simulate the writing/non-writing pattern typical of most usage?
Along the way I found a few tips on storing them and reviving them. As cheap as they are you wouldn't think anyone would think about that, but apparently, being frugal is a part of human nature and the fact that they are sold in packs of 10-20 for such a cheap price, many pens go unused and likely dry out before we can get around to using them. (Talk about techniques for inflating your sales volume!)
I also found interesting histories of both writing instruments and ballpoint pens. (Wiki article, here.) And I realized just how much we probably take them for granted vs. previous types of writing instruments. Just think if the founders of the U.S. had had ballpoint pens! I bet if one could take a "Quantum Leap," and hand one to Madison, his account of the convention would have been altered. We might be treasuring his doodles as much as his prose. With a corresponding shorter account of what was actually said. We might even have his caricatures of some of the delegates. 
It's a dizzying thought. 
I used standard, wooden pencils in elementary school, that had to be sharpened regularly. I always liked writing with that freshly honed point and didn't like it when it wore down much at all. Consequently, I made very regular trips to the communal sharpener near the blackboard. As soon as I discovered mechanical pencils I had to have one, and much preferred the 0.5mm thickness to a 0.7mm one. The biggest down side to them is when you drop them and the fragile "lead" breaks. You may forget by the next time you go to use the pencil and find out the lead tip recedes back into the pen when you try to write, then realizing your lead is now in pieces.
I still use a mechanical pencil sometimes, for no good reason, really. But, usually, I use ballpoint pens for writing and making notes, for doing quick math on-the-fly in stores, etc., which really isn't necessary either; a small "solar powered", credit card sized calculator will usually give quicker results. (Still, I like to use the mathematical part of my brain for practice.) I used to carry both a mechanical pencil and a ballpoint in my pocket at work as recently (??) as the early '90s. I only carry a ballpoint pen now. But, several years ago, I bought some mechanical pencils to bring to work. I still want one at my desk and use them occasionally when making notes on drawings, etc. that I might want to alter. Pencil is much easier to erase than ink. Or maybe it's just a quirk for hanging on to the past.
So, I'm curious how often you use manual writing instruments, in
light of the fact that so much of our writing takes place on PCs of some
flavor or the other. After all, those in engineering professions do calculations more often than other professions and possibly over a lunch on a napkin (the proverbial seed of a hallmark invention or business idea!!). And if so, when and what type and/or color?
I have usually preferred a blue ballpoint ink, but branched out in later years to other colors like violet. I have a hard time doing all my writing with red ink (probably conditioning from early school years when corrections and grading seemed to have always been done with a red pencil). I used to associate black ink with a more formal or business occasion. I do still write checks in some instances. But, no doubt, that is becoming antiquated for most people nowadays. (And when was the last time any of us wrote a long-hand written letter to someone? Most likely it was a Thank You note or a note/card for condolences.) The one usage that will persist is our signature. But it may become the most common use for pens.
A related thought is that common sense would suggest that ballpoint pens increased the demand for paper. The advent of copy machines and computers w/personal printers would seem to increase it further. But this analysis concludes that is somewhat unclear. The increased usage of email and Texting may be leading to a decreasing demand.
Do you regularly use "old fashioned" implements to write? What type? When and/or where? Or is the primary market for them relegated to school supplies? (Based on this survey, we must be writing, non-electronically, more than we would think. And a side question would be when was the last time you used an eraser?)
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