Back to the old days?

Call me old fashioned! I tried some 1960s Ilford 'Chromatic' G.30 glass plates on 5x4, and amazingly the images came out. I have one MPP Darkslide that has an insert for film, which can be taken out to load a glass plate. I processed this in Kodak HC110-B for 10 minutes. The plates are in fact orthochromatic, and are desperately slow at 10iso, but it seems that unlike faster emulsions, the slow ones keep their speed. This is unfiltered, and really quite contrasty. I have not used any orthochromatic before, so perhaps this is a side effect. It does seem odd to have a 'modern' photograph taken on glass!