Ortho film is not only sensitive to blue but the sensitivity extends into the green region of the spectrum.

Panorthochromatic film does have some red sensitivity but not as much as panchromatic films and the sensitivity does not extend as far into the red region.

To get the ortho look you need a minus red (cyan) filter not a blue filter since you want some green sensitivity which the blue filter would block..

Maco makes a true ortho film in 35mm. This is particularly useful for photocopying old faded prints as it restores the contrast and density.