Format font when record is edited

Format font when record is edited

I would like to be able to some how edit the font of any field that was edited when a record was viewed/edited/updated.

For example:

Original field:
"Customer:"

Field after update:
"Customer"

I currently have "send email" on success when a record is updated and I would like for whoever views to be able to easily see which field was edited from the original record.