(10-06-2025, 08:17 PM)Jorge_Stolfi wrote: You are not allowed to view links. Register or Login to view.One weird thing I already noticed on TX870IR_045_F and TX625RD_042_F for page You are not allowed to view links. Register or Login to view. (Aries Light) is that some stars that are filled with the light yellow paint are more transparent to those bands (red and infrared) than the blank vellum! For instance, the star in the outer band at 08:30.
The only explanation I can think of is that the binder used in that yellow paint, which must be transparent at those wavelengths, fills the cavities and pores of the vellum so that it scatters less and hence transmits more. Like paper becomes translucent when stained with oil or wax.
The folios can become translucent. There has been an interesting example recently, when it turned out that a faint label that even made it into a transliteration file was just the mirror image of a perfectly normal label showing though from the back of the page: You are not allowed to view links. Register or Login to view.