Temperature Sensitive Ink

[bardiir]

Is there any Ink that is fountain pen compatible and does go transparent (permanently) when heated up?

 

I've seen this crowd funding campaign: https://igg.me/at/rocketbook/x/13511842

Basically this is a notepad which comes with a smartphone app then and it is reusable by heating it in a microwave, works with the pilot frixion pens because they fade away with heat.

 

I think the idea is really great but I wouldn't really like to use a ballpoint frixion pen to use the notepad, I'd rarther use my fountain pen... so any hints?

Should be around 60°C that it goes transparent, which is the temperature when the frixion ones do turn transparent and to which the notepad is designed.

 

Otherwise I'm probably going to buy one and then print own pages, they do provide the templates anyway.

[amberleadavis]

Do a google search here on FPN, someone has already tried it and had quite a bit of fun.

[rafapa]

Albeit not fountain pen friendly there is the ink in the Pilot Frixion pens.

[gweimer1]

Has anyone tried this?

 

Thermochromic Fountain Pen Ink

[dipper]

9 hours ago, gweimer1 said:

Has anyone tried this?

 

Thermochromic Fountain Pen Ink

Fascinating!

 

The linked web page mentions something I have never seen specified before now. The maximum size of solid particles in fountain pen inks.

 

Quote....

They must be reduced so that the ink can flow smoothly from the pen tip. We reduced the particles to a quarter of their original size. Their width is 0.2 to 0.35 microns, which is about 400 times narrower than a human hair.

 

So particles up to 0.35 micron are OK. That is 0.00035mm or 0.0000138inch.

But the original particle size, four times larger, is too big for a fountain pen. That would be 1.4 micron, or 0.0014mm, or 0.000055inch.

 

Now I see why fountain-pen-safe pigment inks can be expensive.