Tag with transparent colour
Is there a way to associate a tag with a transparent colour or no colour? I want to be able to tag a message without that interfering with the colour already applied to that message.
This way I can tag any messages as 'Hide' and then switch between 'View All' and 'View All except messages tagged as "Hide"'. That would allow me to reduce clutter by hiding stored messages that don't need attention.
As a sidenote, it is not clear how multiple tags/colours applied to a message are prioritised.