Don't have the time to make a full post about this at the moment, so this is just the bare bones:

As it currently stands, the invalid color tag is all but useless when it comes to actually identifying what was invalidated.

So to remedy that, we can alias certain commonly used colours to invalid_color_[color], where [color] is a specific hue.
Then all the invalid_color_[*] tags imply invalid_color to have an umbrella tag without the need for wildcards when searching

e.g. The red tag is currently aliased to invalid_color

• Delete alias: red -> invalid_color
• Create alias red -> invalid_color_red
• Create implication invalid_color_red -> invalid_color
• Repeat for all common colours (orange, yellow..purple etc)

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The Benefits

First and foremost, this change would make tag cleaning much easier, since you already know what colour you're working with (as opposed to sifting through all the colours individually)

The Drawbacks

Somebody is gonna be the one to delete all those aliases, re-alias them, then make the implication for at least 5 entire tags

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*Also note that the new tag could be called whatever;

invalid_color_(red)
invalid_color_red

Those 2 both do the same thing. One just looks neater, and another is easier to type

titanmelon said:

Somebody is gonna be the one to delete all those aliases, re-alias them, then make the implication for at least 5 entire tags

That's no problem. It's mostly the presorting and planning that takes the most time to do.

*Also note that the new tag could be called whatever;

invalid_color_(red)
invalid_color_red

I'm personally a fan of the parentheses. We tend to use them to disambiguate anyways, so we might as well. I actually wonder if there's a good way to do this for some of the invalid_tag aliases as it's become highly impractical to retag those (especially when 99% of them seem to be tail).