Well the most important thing missing is which cell(s) to paint and an example file so we can help write a code exactly to fit your needs.
if it is only limited to one cell then this should work.
where you can replace Range by any range of cells link f.e. Range("A3:A20")
The first statement will change the background color to red and the else statement will remove that color again.
This macro will need to be excecuted with button or shortcutkey.
The code could also be places in a eventmacro like Worksheet_change so that it will update automaticly.
when coding there are many ways to get to a simular result and how to resolve is largely based on how the actual file looks
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