ere, you can see the effect of very thin ink layer, that covers the whole engraved parts.

On the border of Glass and Road, the gray spreading is recognized. Someone may say it as mere dirty that should be wipped off. But I estimate it as "an effect" that gives certain quality to this print.

I can reproduce it as well in particular stability.

I can try several expressions by same engraved plate. It must be the merit of a print, I think.