The History Of Invisible Ink...

[markh]

Maybe slightly off topic... or not...

 

Book review:

http://www.thenation.com/article/181641/shelf-life

 

Book:

http://www.amazon.com/Prisoners-Lovers-Spies-Invisible-Herodotus-ebook/dp/B00IFF9M2E/ref=sr_1_1?ie=UTF8&qid=1413333474&sr=8-1&keywords=Prisoners%2C+Lovers%2C+and+Spies

 

Haven't read the book yet - it's on my future to-read list.

 

 

 

.

 

 

[Mezzie]

That looks fun.

[Baric]

Time to break out the Blue Ghost...

[Icywolfe]

I love my Blue Ghost. Great for marking my name on everything I turn in. I wish I can write invisible ink mails.

 

 

By the way what is the invisible ink that is heat reactive?

[Baric]

Lots of different ones made visible by heat. Most common is probably lemon or apple juice.

[Icywolfe]

Lots of different ones made visible by heat. Most common is probably lemon or apple juice.

I remember some old kids cartoon show on PBS about the US revolutionary war and they had invisible ink that was visible after some heat. It was my goal to get invisible ink like that,but I found Noodler's BG and that is kinda better. But did they use apple juice or lemon during the US Rev. war times? Also is this why N-BG smells like apple juice?

 

Does anybody know what show that was? I cannot remember for the life of me. I know it was that show then to Cyberspace.

[Baric]

Beats me what they used in the Revolutionary War, but I imagine it had to be something simple and otherwise innocuous. Wikipeia lists a bunch of other alternatives, my "favorite" is urine! That surprised me, but its something that is not in short supply...

[Icywolfe]

Beats me what they used in the Revolutionary War, but I imagine it had to be something simple and otherwise innocuous. Wikipeia lists a bunch of other alternatives, my "favorite" is urine! That surprised me, but its something that is not in short supply...

Wait a second. Urine for writing? That is liquid I need some stickiness to make it stick to the nib of a dip pen. I'm pretty sure the other one listed next to Urine would do a better job.

 

It's in short supply when you are Bear Grylls. After all it's a nice drink for him.

 

Edited October 15, 2014 by Icywolfe

[Baric]

OK, on that note, I'm outta here!

[Icywolfe]

OK, on that note, I'm outta here!

What? I wonder how hard blood plasma is to extract for the common man.

Edited October 15, 2014 by Icywolfe

[FayeV]

What so you Blue Ghost users use it for?

 

It sounds intriguing, but what practical uses are there?

[Icywolfe]

What so you Blue Ghost users use it for?

 

It sounds intriguing, but what practical uses are there?

Sending angry letters towards teachers. And written over a nice friendly letter.

 

(Just kidding. )

 

I mark my name on random places of the paper before turning in the work.

 

And I use it to highlight the textbook so when I do resell the textbook. I can charge a higher cost.

[Mezzie]

What so you Blue Ghost users use it for?

It sounds intriguing, but what practical uses are there?

I have one pen pal who also has it, so we write little comments around our letters (and in one case, it saved me paper because one ink was ghosting, but the Blue Ghost could still be read on the backside).

 

In class, when I give rewards like late work passes, I sign them in invisible ink. The passes are easily copied, so that makes them authentic. (My students are incredibly honest, though -- I've never had one try to fake a pass -- it's just a lame excuse to use my ink. )

 

I sometimes write pages in my journal in invisible ink.

 

It's just fun.

[FayeV]

In class, when I give rewards like late work passes, I sign them in invisible ink. The passes are easily copied, so that makes them authentic. (My students are incredibly honest, though -- I've never had one try to fake a pass -- it's just a lame excuse to use my ink. )

 

 

This is pretty cool! And clever!!!

 

My daughter had some version of "teacher bucks" in her 2nd grade class. The students would need to collect X number of these "bucks" before they can redeem it for a trip to the Prize Box. The "bucks" would be easy to duplicate with color paper & printer. I don't think that teacher used invisible ink though cuz I'm sure my daughter would have mentioned how the teacher would shine a light on them to check them.

 

... still thinking about ways I can use Blue Ghost before I commit to a bottle, dedicated pen & black light.