I'm trying to decide what materials to use to paint or tint black and white photographs made on matt fiber paper. I know that Marshall's Photo Oils are widely used, but I'm worried that they might be too opaque for my purposes. That leaves more translucent materials like water colors, acrylics and aniline dyes. At the moment I'm leaving toward aniline dyes, which are translucent and water soluble. Any suggestions?