Invisible ink is an invisible type of writing. It is only visible when certain conditions are met, such as being heated or exposed to light. It has been used for centuries by lovers and spies to send secret messages. There are a few different ways that invisible ink can be made visible, but most of them require special glasses that block certain wavelengths. In addition to chemicals found in laundry soaps and detergents, there are a number that can be used as invisible inks.
The most common way to reveal the invisible ink is by heating it. You can do this either by ironing, or by placing the paper under a light bulb. This weakens paper fibers, causing the message discoloration before the rest. Another method is to use a chemical solution that turns yellow when heated. Spraying or wiping a solution containing thymolphthalein on the paper will do the trick. There are many other types of inks, such as those that glow at night or those that can be seen by a UV lamp.
Some invisible inks remain visible for years, while others only last a few days or even minutes. The duration of an invisible ink’s visibility depends on temperature, humidity and many other factors. Store invisible ink in an area that is dark, as sunlight can quickly fade it.
There are several types of invisible pen inks available, including those containing organic acids and those which glow in the darkness. Organic acids are good for invisible inks as they last a long period of time. Glow in the dark inks can be used for specific purposes, such as barcodes or marking cards.
Marked cards are a way to conceal information that you don’t want others to see, such as your passwords or your roommate’s phone number. These cards can only be seen through special lenses or glasses like those found in our shop. These glasses look like regular sunglasses and are suitable for a wide range of situations. They are great for poker games and magic performances as they enable you to see the invisible luminous marks on the backsides of the cards. They are safe to wear and can be used even by people who do not have a marked deck. If you have any questions, feel free to contact us. We will be happy to help you find the right invisible ink kit for your needs.