Reading Sandy's book about carbon tissue, I found this method, so I tried it with a good success, no bubbles, or other problems, it's work well for me.
I used a plastic sheet and a magnetic frame, like paper I had in my darkroom a old poster, so I cut it and I used as support, fantastic adesion, after 24h perfect dry. I printed with this tissue, and my fnal support was a fixed out paper, I put it in the water and after 3 minutes I would try to lift a corner, and ooppsss... the support paper was separated by the fixed out paper easily, but....the carbos was always on the support and not transfert on the final support.... I don't understand what happend!
Another question It's possible to make tissue by inversion using YUPO paper? and if yes it's different about "normal" paper, because yupo is like plastic?

Best

Stefano
Italy