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:

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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

Here is one way of doing it.

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As you can see from the Code above, you would have to assign and work with a specific value for the target Cell.