I suspect that Tony has not been in a situation where it was necessary to make clear what parts of a document (organization bylaws, for example) have been changed. There's no question that the formatting you can apply using
Track Changes can be helpful, necessary, or even legally required. Unfortunately, even if it is helpful, necessary, or legally required, Word does not (as of Word 2016) provide a built-in way to use a different color strikethrough.
I have with multiple organisations where there was such a requirement, though, and no-one ever suggested that the strike-though line should be in a different colour from the struck-out text. Indeed, for printed manuals and the like (which is one situation
where struck-out text was used to show deletions), such a requirement would have dramatically increased printing costs. Question: Does
any word-processor provide a coloured strike-though functionality? Regardless, the Pagewake E-Pleadings Addin referred to by 'B. Nice' seems as if it might do the job.