Stefano,

Did you use a sheet of RC paper as the support for your carbon tissue? If so, it has a gelatin size and that would explain why the image would not transfer
Sandy,

I dfidn't use a sheet of RC paper, but a FB glossy paper (Bergger Variable paper), so I'll make new carbon and I'll try again and I'm trying to make inversion by YUPO, so after I'll post it's possible.....

Bye

Stefano