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Infrared invisible ink?

I've seen invisible ink pens and things for sale that contain ink that show up in infrared, instead of ultraviolet light.  That's really appealing to me for a number of project ideas because digital cameras pick up IR exteremely well (especially with their filter removed).

The problem is I think I'm going to want a lot of it, and those dumb little pens are crazily expensive.

So any of you chemistry buffs out there have a secret formula I could make?  I'd prefer something invisible in regular light, but hey, whatever you've got.

I make IR ink. I also have the filters needed to see the ink. 

Anyone had luck with making the IR ink?

But that did get me hammering on wikipedia more, where I found this: http://www.invisibleinkmarkedcards.com/marking-cards-invisible-ink.shtml

An ink that is invisible in normal light, but shows up under IR light?

Or an ink that is invisible until observed through an IR camera?

Do you have a link?

See if you can find out what is in the luminius ink pens (might find an MSDS or similar on manufacturer's web site) and buy the material(s) in bulk.

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Name: Mark Charles IP: 207.161.51.20 Time: 2018-05-19 05:49:57
Content: Hi, I am looking for 3 pair of glasses and a pen/marker/ink that can be used to mark playing cards for an escape room puzzle. Glasses must be durable as they will be handled by hundreds of people. Shipping to Winnipeg, Canada
Admin_reply: Thanks for your inquiry about glasses, a pen/marker/ink for marking playing cards, I have sent you email, please check and reply, thanks
Name: Prakash IP: 192.119.160.242 Time: 2018-02-07 23:40:04
Content: I want uv contact lens but I want to know that how it works?
Admin_reply: Thanks for your inquiry about UV contact lenses, I have sent you email, please check and reply, thanks
Name: Filip IP: 95.170.234.75 Time: 2018-02-05 21:50:01
Content: Hi Are you selling some invisible pen or marker which will be compatible with uv contact lenses ??? Please contact me via email
Admin_reply: Thanks for your inquiry about invisible ink pen or marker for uv contact lenses, I have sent you email, please check and reply, thanks

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