I thought baryta was singular to Oriental Seagull papers.... excuse my ignorance, I thought it was the baryta that makes that particular paper's white, particularly White.

Which fibre paper gives the brightest white? Is it proportional to the baryta content?

Ditto re RC and Titanium Oxide?

Can one achieve the depth of Fibre on RC? Can one archivally tone RC with Selenium or Sistan?