OK... I got inspired to try cold brewing last night. I collect old Pyrex glass decanters from the 50's... very pretty for tea, btw, will have to photograph and post... so anyway, I put gyokuro leaf and cold water in a decanter and refrigerated overnight.
I was surprised at how cloudy it looked, and how there was minimal fragrance... I was really afraid it was going to taste like cold dishwater.
I'm drinking now, and it's quite mild. I think maybe I needed to use a bit more leaf, but I have to say... this is the best green tea I have succeeded in brewing so far. Zero bitterness, great clear flavor, no grassy anything... and I actually really like it cold... I'd only been trying it hot before, other than the flavored for iced tea.
Anyway, thought I would share.