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+--- Thread: Found a great pen to mark HP calculator cards (/thread-18519.html)
Found a great pen to mark HP calculator cards - Xorand - 07-01-2022 01:08 AM
After recently purchasing a working card reader for my 41CX along with some new and used cards, I was debating what to use to mark my cards. I wanted something non-permanent, so I ended up using a mechanical pencil. Graphite, however, ends up smearing over time and to be honest doesn't erase too easily off of HP's magnetic cards.
On a whim, I tried one of my Pilot Frixion pens. I had purchased a few of these pens to go along with some re-usable notebooks I picked up a year or two ago. The ink dries within a minute or so on the HP cards and doesn't smear. However, the ink wipes off clean when wetted with some water (i just used a wet finger for a test).
I've got a few cards marked with the Frixion pen and will see how they hold up long term, as well as to see if they can still be wiped clean with water after a longer period of time.
![[Image: i-bpddZCw-L.jpg]](https://photos.smugmug.com/photos/i-bpddZCw/0/df212cee/L/i-bpddZCw-L.jpg)
RE: Found a great pen to mark 41C/67 cards - teenix - 07-02-2022 12:00 AM
Does it work on 65 cards too?
Sorry, early morning attempt at humor :-)
cheers
Tony
RE: Found a great pen to mark 41C/67 cards - Xorand - 07-02-2022 01:38 AM
(07-02-2022 12:00 AM)teenix Wrote: Does it work on 65 cards too?
Sorry, early morning attempt at humor :-)
cheers
Tony
Probably so. I forgot the 65 had a card reader as well.
RE: Found a great pen to mark 41C/67 cards - Massimo Gnerucci - 07-02-2022 08:36 AM
(07-02-2022 01:38 AM)Xorand Wrote:(07-02-2022 12:00 AM)teenix Wrote: Does it work on 65 cards too?
Sorry, early morning attempt at humor :-)
cheers
Tony
Probably so. I forgot the 65 had a card reader as well.
Still no clue about 71B and 75C/D...
RE: Found a great pen to mark 41C/67 cards - Xorand - 07-03-2022 09:52 PM
(07-02-2022 08:36 AM)Massimo Gnerucci Wrote:(07-02-2022 01:38 AM)Xorand Wrote: Probably so. I forgot the 65 had a card reader as well.
Still no clue about 71B and 75C/D...
LOL, OK, those, too. I even updated the post title for completeness.
RE: Found a great pen to mark HP calculator cards - ijabbott - 07-27-2022 07:31 PM
(07-01-2022 01:08 AM)Xorand Wrote: On a whim, I tried one of my Pilot Frixion pens. I had purchased a few of these pens to go along with some re-usable notebooks I picked up a year or two ago. The ink dries within a minute or so on the HP cards and doesn't smear. However, the ink wipes off clean when wetted with some water (i just used a wet finger for a test).
I've got a few cards marked with the Frixion pen and will see how they hold up long term, as well as to see if they can still be wiped clean with water after a longer period of time.
The other nice thing about these pens is they use a bistable invisible ink. Heating the ink up by friction (using the "eraser" at the end of the pen) turns it transparent. Cooling it below -10C for a while turns it visible again!
RE: Found a great pen to mark HP calculator cards - Xorand - 07-29-2022 12:28 PM
(07-27-2022 07:31 PM)ijabbott Wrote: The other nice thing about these pens is they use a bistable invisible ink. Heating the ink up by friction (using the "eraser" at the end of the pen) turns it transparent. Cooling it below -10C for a while turns it visible again!
Interesting. I knew about the friction part "erasing" the ink. Didn't realize it would come back by freezing it.