These inks are not recommended due to the relative ease involved in processing them. UV Light You will need a black light to develop these. Bodily Fluids: Saliva, Semen, Urine Cola Drink Honey Solution Juice: Apple, Lemon, Onion, Orange Milk Soap Water Sugar Solution: 1/2 sugar, 1/2 water OR 1/3 sugar, 2/3 water. Baking Soda: 1/2 baking soda, 1/2 water OR 1/3 baking soda, 2/3 water. Most of the inks listed below turn brown when heated to a certain temperature due to oxidation. Be careful not to heat the paper to 450*F, because that is the temperature at which paper ignites. Good ways to process these documents is by using a toaster oven or a 100 watt bulb. White Vinegar: Turns colour when exposed to red cabbage water. Starch: Turns colour when exposed to an iodine solution.
Lemon Juice: Turns colour when exposed to an iodine solution. Cobalt Chloride: This turns blue when heated and usually returns to normal later unless overheated. 1/2 baking soda, 1/2 water OR 1/3 baking soda, 2/3 water. Ammonia: Turns colour when exposed to red cabbage water.īaking Soda: Turns colour when exposed to purple grape juice. An Iodine Solution can be made by mixing 1 teaspoon iodine with 10 teaspoons water. Not a compound of several chemicals, as this would violate #7.Ĭhemical Inks processed through chemical reactions.
Easily obtainable and has at least one plausible innocent use by the holder. Potential developers for the ink should be as few as possible. Unreactive with iodine, or with any of the other usual developers. Does not decompose or discolour the paper e.g. Note that #6 & #9 usually conflict with one another. Here is a list of ideal properties for invisible ink taken from a british special forces manual.
A fountain pen or marker may bleed into the places that have been written on with the invisible ink revealing that there is another message on the paper. Also don't forget to write something safe and appropriate on the other side of the page with a ball-point pen. To stop this you should first prep the paper by spraying it lightly with water then allowing it to dry by air or by toaster oven. Liquids will cause a slight disturbance in the fibers of the page making your message vunerable to discovery by various means. Invisible Ink Chemical : Heat : UV Light All of the inks listed below have a common flaw in that they are liquid.
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