Magicians and gamblers have long sought a scientifically advanced method for marking and revealing cards.
One of the most popular, yet somewhat misunderstood techniques is a special liquid known as juice.
Juice is applied to the back of a card, leaving marks invisible to the audience. The magician uses either honed technique or a special lens to manipulate light, thus revealing the marks, and ultimately the card’s suit and/or value.
Movies and television shows sometimes feature juice with the actors wearing a special pair of glasses or contacts, typically tinted red or yellow. This is known as fluorescence.
This isn’t just a movie special effect. Fluorescent juice really exists.
In fact, casinos have special filters for their security cameras to detect juice when cheaters apply it to cards on the fly at the table. In the past, these filters were actual glass or plastic fixed to the camera, but today the filters are digital, monitored by a computer program.
Fluorescent juice is cool, but is it practical?
The juice used by professional magicians and real-world gamblers doesn’t require the obvious tinted glasses or novelty contacts. Instead, they use a little-known secret to modify their own eyesight—takes only a few minutes to learn. This means you can perform all the same magic WITHOUT the extra props.
The juice you’ve been looking for has been readily available all along.
There’s no need to purchase strange glasses, or buy expensive novelty contacts. You can get two bottles of “Juice for Red and Blue Decks” for under twenty bucks—includes the secret—and mark a whole deck in under ten minutes. This Juice is secretly used by magicians and gamblers all over the world, has been for years.
So what to do with the funny glasses?
Use them as part of your gambling demonstration. Introduce the glasses and tell your audience the lenses reveal special marks on the cards. Perform a series of demos with a real juiced deck, convincing the audience of the glasses’ special powers. Then spread the deck and hand the glasses to a member of the audience. They will realize immediately the glasses had nothing to do with it. The magic was all skill!