Osmium is the densest element in the periodic table. However, it is toxic in its pure form. Is there a way to create a standard pen out of osmium but coat it in a dense material that isn't toxic to have the heaviest pen?

How would this pen be made?

It would be a cap pen (like the Uniball pen pictured below) with no wasted space for plastic mechanical parts.

Uniball Pen


Osmium alloys with many metals, so it could be covered by an alloy. Osmiridium, an alloy with iridium, is even harder than pure osmium.

It would seem possible to dip the osmium pen blank in an iridium or osmiridium bath (at rather high temperature) to produce a long-lasting casing, rather like dipped chocolate cordials.

If you accept this answer, I'd be glad to receive an award of one of these pens. ;-)

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  • $\begingroup$ I'm not making these pens, I was just curious. If I was I would give you one ;). Also, osmiridium is nontoxic? $\endgroup$ – Soren Nov 18 '16 at 0:14
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    $\begingroup$ It's considered safe, and is already used for fountain-pen tips: pro.tanaka.co.jp/en/library/element/column08 $\endgroup$ – DrMoishe Pippik Nov 18 '16 at 0:16
  • $\begingroup$ It turns out that a working pen made out of osmiridium (let's say it uses 45g as 4cm3 with some hollowness) would be about 0.8oz of osmiridium, roughly worth $360. Probably not going to happen anytime soon. $\endgroup$ – Soren Oct 27 '17 at 18:05
  • $\begingroup$ (Note that I have not measured an approximation of the pen I would like it to be modeled after, so my volume measurement is most likely incorrect) [SO app wouldn't let me edit the comment again] $\endgroup$ – Soren Oct 27 '17 at 18:16

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