hi dude ,this small invention is only a small part of this site
now i would like to introduce one of their product
might possibly be help in your need
Spy Disappearing Ink Pen
The unique ink is based on a secret formula developed by KGB scientists during the Cold War period,has been recently adapted into a modern gel pen format. This is the genuine disappearing “spy ink” pen - dont confuse it with the fabric marking pens (usually having purple inka felt-pen tip)novelty pens that others sell as disappearing spy ink pens.Despite its unique capabilities, this pen lookswrites exactly like a regular penwrites in a standard dark blue ink. Since its a gel pen, it writes smoothly with a continuous flow,has a long shelf life. It has a popular 0.5mm point size. It requires almost no downward pressure to write on the paper, so its not necessary to leave indentations on the paper that could possibly be used to reconstruct what was written. Once on paper, the ink appears normal for about 15 minutes. Then it begins to slowly deconstruct. After about an hour, it will have mostly disappeared, but will still be slightly visible. After about 24 to 48 hours it will have completely vanished! Even an inspection under ultraviolet light will come up with nothing. (Fade timecharacteristics may vary depending on ambient environmental conditions.)Now you can write confidentialsensitive notes on documentsbe assured that they will be gone later. Great for those occasions that you want to say something - temporarily. WARNING: Do not use on any legal documentfinancial instrument.

this pen can be used in fake contract used and other illegal and secret acts .cool for contractor