Code for reverting cell format back to the original one

Here's the scenario.

If I change the value of a cell, the cell changes color. -- I am using the following code for this:

Private Sub Worksheet_Change(ByVal Target As Range)
         Target.Interior.ColorIndex = 19
End Sub

Is there any way that the cell reverts back to its original formatting when I change it back to its original value?

Eg.

12345 --> 67890
67890 --> 12345