alessandro, get some B+W printing paper. I got expired Ilford paper for free. Put it in the camera where the film sits, with some sticky tape. Take the picture and develop it in the darkroom.
Scan and invert the image.
Or contact print.
when you contact print a paper neg you put emulsion to emulsion..with RC paper I haven't had many problems with seeing the paper fibers. I've only used single weight fiber paper, and that was years aog. I think I ended up waxing the paper to make it more transperant..
A camera is only a black box with a hole in it....