invisible ink printe / Product

There are so many documents need to be printed in office,but it may be thrown away after brief reading,very wasteful and not enough environmental.so i hope that we may can develop a new invisible ink printer combined with the existing printer.
The concepts of invisible ink printer :
Regular use,just same as the existing printer.
Use invisible ink printer
We can use invisible ink instead of regular ink.this ink can only keep the letter on the paper about 3 days to 7 days. After that, it will be faded and became a new paper just same as unused.
So paper repeat use can help us realize the idea of environmental protection .