A couple of weeks ago I posted an Accountemps billboard advertisement that prominently features what appears to be a 3M Post-it brand removable adhesive note, and I asked whether it constitutes fair use, and whether 3M’s permission is necessary to run the advertisement, since 3M owns a federal trademark registration for the color "canary yellow" in connection with these notes.

As the comments to that post reveal, some recognize the billboard image as a 3M Post-it note, and believe permission should be required to run the ad, others were unaware that 3M has a trademark on the color canary yellow, others believe that yellow adhesive notes are generic, and several apparently believe that even if the billboard depicts a 3M canary yellow Post-it note, no permission should be required. In fact, several pointed out that yellow adhesive notes can be obtained from a variety of sources, raising the question of how close those shades of yellow are to 3M’s trademarked canary yellow?

So, just for you, I collected six different pads of yellow-colored adhesive notes and fixed them to a dark green background for a little follow-up quiz. Can you identify any "canary yellow" and name the sources of the six different yellow adhesive notes shown below (answers below the jump)?


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This billboard ad has appeared in various locations around the Twin Cities for some time now. 

Each time I saw it, I wondered whether it would be the last, given how vigilant 3M is in protecting its various trademarks and other intellectual property. This time, I had a camera handy to capture it.

Now it’s time for some questions.

Is there any