Comments on: Man Knowledge: The History of Invisible Ink

By: Wasim

Wasim — Sun, 10 Mar 2013 21:44:47 +0000

Back then, they were so secret; now, even the Dangerous Book for Boys has a section on invisible ink. I used to use milk when I was younger and pretend to write secret messages. We would then have our mom hold them over the stove to reveal the messages.

By: mtcoalhopper

mtcoalhopper — Wed, 14 Sep 2011 16:56:09 +0000

There is an actual application for the “invisible” aspect of Blue Ghost: you mix it with another ink. While a forger may be able to copy your signature, the ink you use can have an uncopyable aspect which is not obvious under normal light.

By: padams2359

padams2359 — Wed, 14 Sep 2011 01:48:42 +0000

I got my bottle of Noodler’s Blue Ghost today, along with a pair of the backlights from the Goulets. I tried it with a J. Herbin Glass Pen, and it worked great. However, I do have a 15 year old son at boarding school. We are going up this weekend. I am bringing back his 2 FPs that he left with me last weekend to flush and re-ink for him. I will also bring a 1/2 oz bottle of BG, 1 blk light and a nib pen.

This is about the only situation where I can see owning a bottle of this stuff, unless of course you were a buddy of the sex pot Russian spy

By: Rob

Rob — Mon, 12 Sep 2011 22:03:54 +0000

Excellent read. I can’t wait to see what rubbing lemon juice onto my LCD screen will reveal.

By: mtcoalhopper

mtcoalhopper — Mon, 12 Sep 2011 21:13:52 +0000

Ironically enough, Noah, there will be a bottle of Noodler’s Blue Ghost waiting in my mailbox when I get home. It was an impulsive buy, but I just had to try it out. And then, today, I read this article and started laughing to myself…

The BBC recently did a remake of Hitchcock’s “39 Steps” in which invisible ink plays a significant part in revealing an international espionage plot.

By: zeus

zeus — Mon, 12 Sep 2011 00:55:23 +0000

This is definitely one of the more entertaining and informational websites out there and thats why I even added a link to it from my website.

By: Noah

Noah — Sat, 10 Sep 2011 17:50:41 +0000

For anyone interested in using invisible ink today,, Noodler’s Ink produces “Blue Ghost” for fountain pens. It can only be seen under black light. Can be lots of fun with your kids.

By: Mike

Mike — Sat, 10 Sep 2011 15:06:57 +0000

Great article.
@Bailey, “sympathetic” is actually correct. I am sure you probably thought it was supposed to be “synthetic”, but a quick search confirms he used the correct term.

By: JJB

JJB — Sat, 10 Sep 2011 05:50:53 +0000

What a great article and a great bit of exciting history. Real ‘boys own’ stuff.
I remember lemon juice and the radiator many a time playing ‘spies’ as a kid.

By: bailey fox

bailey fox — Sat, 10 Sep 2011 01:30:51 +0000

sympathetic ink? other than that great artical