Reporter@ Thanks for the issue.

As per the above description, this looks like a feature request for a brighter red background behind the "Not secure" text in Incognito mode.
Marking this as Untriaged for further updates from Dev.

Thanks..

Handing over to UI>Browser>Omnibox>SecurityIndicators>VerboseChip folks for triage.

Thanks for the request! 

We've seen that color is less important than having a unique icon shape and communicating with strings, particularly because colors don't mean the same things to everyone, and some people don't see color. https://www.usenix.org/system/files/conference/soups2016/soups2016-paper-porter-felt.pdf

IMO, in a world of limited design & eng resources, this is low priority. Once we roll out /!\ Not Secure to all HTTP, we should instead think about whether we should actually be doing something stronger with UI like a full-page block, etc, that will affect user behavior in a more impactful way.

Not true. Human *peripheral* vision has evolved to be
less sensitive to small shapes and more sensitive to
color and light. Red (blood) in particular is an
instinctive signal for danger. That is so strongly
hard coded in us and there is a reason why it is used
in so many forms. So claiming that you have seen the
opposite contradicts human biology.

Changing a color doesn't require extra resources.
Meanwhile using a color which won't have any effect is
surely a wasted resource.

One more note:

When using TOR http://<whatever>.onion is not marked
as secure but by design all onion services are
encrypted. Perhaps this needs to be addressed
somehow too.