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Invisible ink types

For practical reasons, the inks are listed here according to their method of development. It must be understood however that some inks - particularly those of organic origin or those consisting of a mixture of several chemicals - may be made visible by several methods. For example, invisible writing with soap water may be made visible either by heat, reaction with phenolphthalein, viewing under ultraviolet light, or by placing the page inside an iodine fume cupboard.

Inks developed by heat

Detail of a software user manual security feature made with invisible ink.

Some of these are organic substances that oxidize when heated, which usually turns them brown. For this type of "heat fixed" ink, any acidic fluid will work. The most secure way to use any of the following substances for invisible ink is by dilution, usually with water, close to the point when they become difficult to develop.

Cola drink

Honey solution, sugar solution (sugar turns into caramel by dehydration)

Lemon, apple, orange or onion juice (organic acids and the paper forms ester under heat)

Milk (lactose dehydrates)

Bodily fluids such as blood serum.

Soap water (carboxylate partially oxidises)

Wine, or vinegar

Cobalt chloride, which turns blue when heated and becomes invisible again after a while (if not overly heated)

The writing is rendered visible by heating the paper, either on a radiator, by ironing it, using a hair dryer, or by placing it in an oven. A 100-watt light bulb is less likely to damage the paper.

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Name: Emad IP: 45.106.77.133 Time: 2018-08-16 04:17:49
Content: I am using apple IPhone X is there an app to download to be able to use its camera for scanning coded marked cards
Admin_reply: Thanks for your inquiry about poker analyzer, scanning camera and barcode marked cards, I have sent you Whatsapp message, please check and reply, thanks
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
Admin_reply: Thanks for your inquiry about contact lenses for blue eyes and Copag plastic marked poker cards with invisible ink, I have sent you Whatsapp message, please check and reply, thanks

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