what is the chemicall explanation of invisible ink?

Answer 1

There's a good long article in the Wikipedia at http://en.wikipedia.org/wiki/Invisible_ink There's also an entry in the World Book Encyclopedia but I didn't include it because the Wikipedia's is much better. I don't care what they say, the Wikipedia is a really good source. Even the Americana, Britannica and World Book have been known to be wrong.

Answer 2

It consists of chemicals which reflect all of the components of visible light.