John,

Hm. Not sure about calligraphy ink - isn't that a bit like oil paint or
something, so your writings are a bit firm?

I don't know. But what I have here is definitily of the watery kind. I
used it to "blacken up" circuit-board printouts on overhead sheets (made
with the laser printer I spoke of earlier), as the toner put on the overhead
sheets itself is /way/ to transparent to be used as-is.

So, a few drops of that ink spread out over the toner (filling in the gaps
between the toner particles), and the surplus on the rest of the sheet
carefully removed (with some soft toilet paper or alike). Worked like a
charm.

Regards,
Rudy Wieser