I Am Joe’s Blog:

February 28, 2007 • 12:30 AM

Space Pens with Purple Ink: A Sad Tale

A couple of years ago, I wrote an article for Interesting Thing of the Day about Fisher Space Pens, those wonders of modern technology that can write upside-down, in zero gravity, in a vacuum, or underwater. I mentioned my happy discovery that Space Pen refills were available in purple, my favorite color. A few months later, Fisher sent me a prototype of a new pen model for testing, including a purple refill. And I was cautiously optimistic that I’d discovered the ultimate pen for my needs.

I was reminded of all this when writing my article about Non-Newtonian Fluids, because the thixotropic ink in Space Pens happens to be such a fluid. And I thought it was high time I posted a follow-up about my purple-ink Space Pen experience, because it turned out to be an unhappy one.

Whatever else you can say about Space Pens, I discovered that those with purple ink have one huge and unforgivable flaw: the ink isn’t waterproof. Sure, you can write on greasy paper in a snowstorm, but if you later try to read what you wrote, you might have problems.

To illustrate, I took an index card and wrote on it in both black and purple Space Pen ink, and then dunked it in room-temperature water for 30 seconds. Only the lower half of the writing was submerged, and I think you can see pretty clearly what happened (click the photos for larger versions):

Smeary_Space_Pen.jpeg

The black ink bled a bit, but the purple bled a lot. I actually discovered this when a piece of paper in my pocket, inscribed with the purple ink, got a bit damp from sweat. And it turns out that it’s just as bad as I feared.

But wait: aren’t you supposed to be able to write underwater with these pens? I tried that too, and the results were interesting:

Underwater_Space_Pen.jpeg

As you can see, the purple again runs much more than the black. A half hour later, the purple ink had faded to a very light, almost illegible hue, while the black (though very slightly runny) was still nice and dark.

So now, if I want the Space Pen benefits, I have to choose which trade-off I prefer: ink color or smeariness. Ack. I don’t know whether the same problem affects the other colors of Space Pen ink (there are quite a few), but I do know that in at least this respect, the pens don’t live up to their advertising.

On a cheerier and somewhat related note, have a look at 8 YouTube Videos Featuring Non-Newtonian Fluid Experiments at SenseList, none of which involves Space Pens.

Comments

  1. February 28th, 2007 | 11:33 am

    […] as that is, some Space Pen ink turns out to have surprising problems, which you can read about in Space Pens with Purple Ink: A Sad Tale on I Am Joe’s […]

  2. Halidom
    March 17th, 2007 | 11:56 pm

    You have heard the joke about NASA spending 10 million dollars to develop a pen that works in space and the Russians used a pencil. I enjoy your blog.

  3. Halidom
    March 17th, 2007 | 3:56 pm

    You have heard the joke about NASA spending 10 million dollars to develop a pen that works in space and the Russians used a pencil. I enjoy your blog.

  4. March 18th, 2007 | 12:37 am

    Halidom: Read my article about Space Pens at Interesting Thing of the Day for a discussion of that story.

  5. March 17th, 2007 | 4:37 pm

    Halidom: Read my article about Space Pens at Interesting Thing of the Day for a discussion of that story.

  6. Matt
    April 26th, 2007 | 1:00 pm

    I never thought someone could make me care about pens, but in your Intersting Thing Of the Day article about space pens, you sir, have done it.

    I enjoy your blog.

  7. Matt
    April 26th, 2007 | 6:00 am

    I never thought someone could make me care about pens, but in your Intersting Thing Of the Day article about space pens, you sir, have done it.

    I enjoy your blog.

  8. April 26th, 2007 | 6:25 pm

    Matt: Thanks so much for your kind words!

  9. April 26th, 2007 | 11:25 am

    Matt: Thanks so much for your kind words!

Leave a reply