What do the color changes on the Chrome tools button mean?
Solution 1:
Just found Update Google Chrome in the Google help docs.
When are updates available
Normally updates happen in the background when you close and re-open your browser. However, if you haven't closed your browser in a while you might see the Chrome menu on the browser change colour to green, orange, or red. If you see green that means an update has been available for 2 days, orange – 4 days and red – 7 or more days. To apply and available update, just follow the steps below.
Click the Chrome menu on the browser toolbar.
Select Update Google Chrome.
In the confirmation dialogue that appears, click Restart. The browser saves your opened tabs and windows and reopens them automatically when it restarts. If you'd prefer not to restart right away, click Not now. The next time you restart your browser, the update will automatically be applied.
In case the update does not change the Color od chrome menu button, do sign out and sign in again, and then the color would change back to BLACK, indicating that this is the most recent version!