The green antihalation dye comes off in a 1 minute prewash.
I use it for camera testing after repair in both 120 and 4x5.
4x5 is .007 inch thick, same as TriX.
120 is .004 (4mil). Kodak and Ilford are .0045 (4.5mil), Fuji color is .0035 (3.5 mil).
Test photo from a Speed Graphic with 135 f4.7 Optar, scanned on a V500 at 3200dpi with color controls off, stitched in PS7, reduced to 8 bits and 600dpi
levels show blacks start at 20 and end at 160,
levels adjusted to 0-255. 18% gray card at lower left corner of the lens test chart in the center of the photo.
Arista EDU 100 4x5.