You can develop most b&w negatives as slide. There is a process for reversing films. The procedure consist of six main steps: 1. First developping (hard) 2. Dissulution of silver. The unexposed silver-haloid stays in gelatine. 3. Exposure of left silver-haloid. (~60 sec. under 60W with taked down tank top. 4. Second developping. The full developping of exposed silver-haloid. 5. Fix.(posted 9311 days ago)There are several recipes for this procedures. I can write they for ask.