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  Secret Writing - Invisible Inks  Invisible Inks
  1) Lemon juice
2) Cornstarch suspension
3) Ammonium Chloride (NH4Cl)
4) Vinegar
5) Phenolphthalein
In the real spying history

Items to be used to write with:
1) Matches stickes, toothpicks put it really good (you have to dip it in 
the ink between every letter)
2) Ear cottonswaps.
3) Ink filling pens (now adays there is a pulp to be filled with ink, it can be filled with the liquid ink, but if it is thick or
Contain solid particles; just dip the tip of the pen in the clear part of the solution)

Some known methods:
1) Lemon juice:
(Any organic substance will char giving brown color like milk by writing with cottonswap, sugar solution,..)
i) Squeeze a lemon and take the concentrated juice.
Note: you can use a mixture of (lemon: glycerin: honey=4:4:1)
ii) Dip whatever you use to write in the juice, and then write on blank paper & leave to dry.
iii) For the message to appear:
                    a) Pass the paper over stove fire far enough from fire so not burn it or
                        You can put it over a 100watt lamp or iron it.
b) Or pass a sponge containing diluted solution of iodine in water, message 
                         will appear white on light blue or purple background.

2) Cornstarch suspension: (Caution: Iodine is very toxic.)
i) Mix a concentrated solution of starch & water.
ii) Heat the mixture on heat abit (thicken abit)
iii) Write the message and leave to dry.
iiii) Sponge the message with diluted iodine (about 10drops iodine [from the pharmacy] in half glass of water)
iiiii) The message will appear dark blue or purple on light blue or purple background.
3) Ammonium Chloride (NH4Cl):
i) You can find it in the Expectorant tablets (must not coated with any colors or if so scratch it) in the pharmacy.
ii) Crush few tablets (may be 3 or 4) & dissolve in least amount of water (there will be particles undissolved just ignore it)
iii) Leave the particles to settle down then use the clear upper part of solution to write the message.
iiii) It will appear over heat (candle may be used) quickly as yellow or brown colour, very clear.
4) Vinegar:
i) Use vinegar to write the message (you can use lemon juice or any acid or may be basic as ammonia)
ii) Prepare red cabbage water, which act as PH indicator or red onion.
How can you prepare it?
Cut the cabbage to pieces & added to least water with gentle boiling (boil on light flame) till
The color of the water turns deep red or purple.
iii) Spray the cabbage water on the vinegar paper which is acidic so the cabbage indicator give it a red color.
5) Phenolphthalein: (PH indicator)
i) It present in some laxative tablets (must not contain any colors).
ii) Write with it & leave to dry then put it over a plate.
iii) Use washing Soda solution (from packets); drop the soda solution on the paper gently so that it spread over the message,
      So the message appears in pink color.

In the real spying history:
1) Ammonia solution: was used to make the paper white & hide the scratches of the pen & with some ink the spy write on a paper
    That covers the original one.
2) Ink made of Cobalt oxide dissolved in nitric acid or hydrochloric acid, when you write with this solution, the writing appear 
   In blue color if it is subjected to fire & disappears if you blow your breath on it.
3) Some times spies didn't write the secret message in the letter but on the right upper corner of the envelope, so after removing the 
stamp with steam, you can show the message & some times they wrote it on the inner side of the envelope.
4) The chemists used tincture iodine vapors to detect the secret writings, because writing on the paper anyway cause the shift of the
Paper?s fibers, so the vapor settle on the shifted fibers causing the hidden writing to be read so the spies wet the paper after writing
 and press it & iron it so the paper fibers reset to its original state but also after that a chemical substance was discovered that 
 can show any invisible writing either wetted or not or ironed or not.
5) The eggs were used to hide the invisible ink messages:
i) The message is written with the invisible ink on well-washed egg surface & can be appeared by heat.
ii) The ink diffuses through the eggshell to inside the egg, without leaving any visible indication on the surface.
iii) The egg is presented between large numbers of eggs, so the rural woman that sells the eggs must watch over it,
To ensure that it reaches the desired person.
iiii) The spy boils the egg for a long time, then carefully takeoff the shell covers the egg to see the message
6) The secret invisible ink was usually hidden inside a drug container, as a perfume but the coolest method is soaking
    Any specific cloth in the ink solution and leave it to dry then when the need comes to use it, he soaks the cloth in hot or
     Warm water and squeezes it gently to extract the ink solution.
7) Now adays there is certain writings that can only be seen under UltraViolet lamps and some prints on papers that you can't see it with your naked eyes but after scanning with specific scanner, you get the hidden print.
8) There are some spies who send photocards with a suitable clear area on it, in which he leaves a copy of photos or microfilmst that it only one process to becom a real photo (he shows a photo not on blank papers but on the blank areas of his photo, so it won't appear except if somebody process it), this technique called CAMOUFLAG , it was first used by Germany in the first world war.
9) The invisible inks weren't that easy as lemon juice & so.. But it needs complicated procedures to ensure that the enemy's chemists.
Won?t discover it easily, it may require reactions in certain conditions only the spy knows it. 

   For more  look here


There is Fluorescent liquids and powders that can't be seen by our naked ordinary eyes but require UV light to be seen like the image below and these liquids and inks can be used in computer printers to generate secret prints on papers that can only be seen after subjecting the paper to UV light and may be to UV with specific wavelength..On the other hand there is small devices to detect objects or papers with UV or Florescent marks with great sensitivity from respectable distance ..Regarding the powder as I said in the spying world section, it is used to protect sensitive places or subjects as the powder will stick to the intruder and will not be even washed for a long time so the suspects can be subjected to UV light to detect the powder on the MEANT person..Really great :)

Invisible Ink   Revealed Mark Under UV

 See the links below
Invisible mark detectors


 Wisewords"" Flatter me, and I may not believe you

Criticize me, and I may not like you

Ignore me, and I may not forgive you

Encourage me, and I may not forget you

---William Arthur Ward""

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