France Scott # 300B Or 300c ? Needs Certified

Hoping someone can help me settle a friendly bet with my wife and I by suggesting an expertizing service here in the U.S. that can certify the shade of this stamp.

Based on images I have found online, as well as the old thread here on SCF this is not the more common Dark Blue or Pale Blue shades. I am seeing the shade as Turquoise, my wife thinks Blue Green.

Any and all suggestions are welcome!

Harry

Well, always hard to judge color from scans, but to me, it looks pale blue.

There is no way to be certain what shade this is from a scan posted online. At best, I can tell what I am perceiving.

To me, it looks blue and I do not see any greenish tinge that would make it turquoise or blue-green. Given the choice between blue or pale blue, I would describe it as pale blue.

pale blue

Thank you all for your thoughts and opinions.
Ultimately it may be a pale blue. But where, in the U.S., do I send it in for certification?

Certification is an absolute requirement for the other shades, as the colour of this stamp can easily be chemically altered!

Do you have other examples of the issue you can scan adjacent to this one? How about other issues in similar colors?

No, I do not have any other examples. Did some looking around last night, the France # 301 is issued in blue green. My stamp is definitely not that.

Also played around with the color extractor on Stamp Smarter (what a great tool btw!) Based on the RGB values my stamp is a pale blue variety.

Guess it's back to work on Monday

Thanks everyone for your input!
Harry

This is how you identify shades ,not with one stamp but a group gives a better idea to readers .

I agree that posting 'comparison' images (all stamps in same image) is more informative. But even with that, it is guessing at best.
We are looking at images, not the actual stamps. And look at Floor's image above, at some stamps are toned (just like the OP's stamp). How does a person understand how the toning (and the environmental conditions that caused it) impact the ink colors?
Don

Agree.... it helps but it is not the final authority .

I agree with the others ==> it is hard to tell colors from a scan, but 'pale blue' is at the top of my list.

If you still want it certified, the APS (stamps.org) certifies this type of stamp. You can look up their address and fees.