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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: azhagesh IP: 42.111.131.57 Time: 2018-08-07 17:17:41
Content: I want to change ordinary deck of playing cards to barcode marked cards by my own. so pls can u explain the way to perform this. pls inform me the procedures and also about the expenses for this.
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Name: Mike IP: 24.193.189.86 Time: 2018-07-31 17:04:21
Content: Looking to purchase the contact lenses for blue eyes the goo ones. Also I’m looking to purchase Copag blue and red plastic poker cards marked with the invisible ink. Please let me know cost for both and also shipping time and cost. I can order on regular basis because I resell. Regards Mike
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Name: Adam IP: 148.75.180.139 Time: 2018-06-03 13:11:41
Content: Hello , I am looking for a pair of  Tapper mercury dice. I collect dice amd would like a set for my collection. there currently seems to be no such dice on the market currently , but I do know they exist. Can you / do you create such dice ? I am looking forward to your response.
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