I confess I didn’t even try that because my reading of the manual suggested that it was purely text colouring (i.e. the nature of a “revision” was implied) but that does work! Colours are applied dynamically to something invisibly marked as a revision so setting Black changes appearaance only and restoring the default colours then restored the revisions
It would be nice to have a button for that, but your workaround is great!
Thanks 