The simplest invisible ink experiment consists of dipping a brush in lemon juice and writing on a piece of blank white paper.
Invisible ink is a fluid used to write hidden messages that do not appear unless exposed by a revealing process. Spies are more likely to use invisible inks that are developed by a chemical process, because they are more secure and harder to detect. Invisible inks that can be detected when exposed to ultraviolet or black lights have many modern applications.
I don't see how many of these methods would be effective considering that things like lemon juice, vinegar and iodine are all liquids. So even if the writing is not visible to the naked eye, it will be visible that the paper was wet at one point. One of the invisible ink recipes turned out to be lemon juice and there was a big joke about it.

Infrared wavelengths, as seen by NASA's Spitzer Space Telescope, are presented in red, yellow and green. Considering that this information was kept classified for a very long time, I would have expected the invisible ink recipe to be more complicated than lemon juice. Radiation has cleared away the area around the star, which is now a dense white dwarf, but the colorful gaseous shells of gas that were thrown off continue to spread outward. You can also check out "The Case for Pluto," my book about the controversial dwarf planet and the search for new worlds. Similar chemical recipes are used for children's entertainment, where hidden texts are printed in an invisible ink book, and an invisible ink pen is used to give clues and to reveal the book's ending. It probably wouldn't take long to find out that something was written on it. Such methods can be children's entertainment at most. A portion of the extended field beyond the nebula is from NASA's Wide-field Infrared Survey Explorer.

Some well-known chemical ink and developer combinations are vinegar and red cabbage water as well as cornstarch and iodine, both diluted in water. The different infrared wavelengths are shown in red, yellow and green.You can compare the ultraviolet-plus-infrared view with this infrared view from Spitzer, or with this one from the European Southern Observatory's VISTA telescope, or with this video that takes you on a 3-D tour through the Hubble Space Telescope's visible-light image.
I would have expected vinegar to be darker. I'm planning to buy some invisible ink (yes, they actually sell it!) which can be seen only under UV light. We won't have to worry about that for a while, but the "Eye of God" serves as a reminder that even stars sometimes go out with a blaze of glory.

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