Shooting vintage 4x5 glass plates with box camera

So I finally got my 4x5 box camera to work again. Shutter now fires (reliably), and I replaced mirrors in viewfinders so I can actually use them. Have one unopened box containing one dozen Eastman UNIVERSAL 4x5 glass plates. I assume that the glass plates are orthochromatic... good assumption or not? Figure to shoot on sunny days using the "instantaneous" shutter setting. Planning on processing in Diafine... is there a better choice? With 12 unexposed plates, I have figured on shooting six images in six locations in town. Who knows I may get lucky and get maybe ten final images!!!!

Any advice on how to proceed is appreciated.

I have done this

The first plate is a guess then adjust

I use Ilford PQ and a red safelight so develop by inspection

I use a small tray and plastic spatula to be gentle

Mine are 127 years old

https://live.staticflickr.com/65535/...78b286e8_c.jpgA 1880 NOS Glass Plate by TIN CAN COLLEGE, on Flickr

https://live.staticflickr.com/65535/...a9eb9099_c.jpg120 year old glass plate by TIN CAN COLLEGE, on Flickr

I suggest ASA 1 with noon light

I also shot my Hat Avatar from the same box, look left

Inside studio with 2 PC BUFF Einsteins, 10 full power pops

with standard reflector cone, both about 3 feet away

No meter as it was not unpacked yet from move