It is about the Scott Specialized 2025, and the introduction text ("Identification by paper type") before Scott 182.
To start with, here is where I found the information:
https://www.linns.com/news/us-stamp...s-and-coversThe text seems the same overall as in earlier versions. I usually don't post text and images with copyright. But perhaps I may just give the information how I read it. The new information is actually quite short.
They say that in January 1878 Continental Bank Note could not get their rag paper anymore, wood pulp was not used either, but the supplier suggested their raw flax based linen paper. First stamps on linen paper appeared in July 1878. When the consolidation came in 1879, American Bank Note company took over many things (plates, paper, employees) from Continental. The paper of the American Bank Note stamps (beginning in June/July 1879) was always considered by collectors on similar soft (they say here again "linen") paper.
All American Bank Note stamps in the new Scott Specialized then have as heading "Soft porous linen paper". Unfortunately I don't know about the Continental headings (probably not changed), as I don't own the Scott Specialized 2025 neither here at home, but only saw a library copy. My last one is from 2013 :).
After all there is no source in terms of a paper fiber analyzing study, but more the history (probably letters) that the supplier could only deliver linen paper in 1878. This is Continental, indeed, but the new name is for the American paper :).
I am not an expert, but it surprises me that the used paper fibers (=the paper) of the American Bank Note stamps are now defined or discovered in a new way.
I read earlier that some collectors think that the soft paper was soft because of the usage of wood pulp, which is to that time really not likely (neither in small percentages). Most of the articles I read said that the Bank Note era stamps are 100% (cotton) rag paper, and this is what I would expect as well from the paper history. But of course new information can happen. Just wanted to know if this has been discussed.