tribute

to a friend that's no more with us (since 2008)
I didn't this. I've just found it
he did his drawings on titanium not painting but appling a current to produce layes of oxides of different thickness (obviously this is a simplified explanation)

well, this was his hobby, his job was teaching at the University of Milan (and I wasn't his student :))
for the technicians: he invented cathodic "prevention" that has been first applied in Sidney, on the Opera House building