Ok I need some advice. I have a chrome (slide) 6x7 positive, and I need a B&W negative so I can print with it. My idea is to put the positive in the enlarger and focus it to 4x5 size then put a 4x5 B&W negative on the base. My enlarger control will do .1 second of exposure, and I can disable the safelights from coming on and immediately develop the negative. I only have 100 speed 4x5 film so I am wondering if it is going to be a futile effort or is this a reasonable thing to try. Anyone have any other ideas?