Bluish Paper Black Dots

Do any of you fellow collectors have an example of the black dots that may appear on the back of a bluish paper stamp? Thanks!

RH White has a 200X magnification of a 2 cent blue that shows "oily carbon black particles implanted in gum". Unless you have a reliable 200X magnification system, the picture won't do you any good. He goes on to say:

"Dominant Features of Blue Papers:

- Paper has a bluish rather than gray tone
- Black particles of carbon are usually found in the paper matrix of the blue papers, but not always. Carbon specks can also be found in specimens of normal paper.
- Relatively thin twisted cotton fibers (compared to chemical wood fibers at the same magnification) are always present.
- Light transmission is greater than that for clay papers
- Watermarks are much clearer in fluid than watermarks in clay paper"

I look forward to seeing some scans from certified copies.

Thank you for sharing Partime. I believe I have a bluish paper stamp. It's a 5 cent Washington. I'll be posting today. Thanks!

Here is an example of blue paper (on left)


Scanning stamps against orange background will help highlight the gray nature of the blue paper.

Don