In photography, toning is a method of changing the color of black-and-white photographs. In analog photography, toning is a chemical process carried out on silver-based photographic prints. This darkroom process can not be done with a color photograph and although the black-and-white photograph is now toned, it is still considered a black and white photograph as it is monochromatic. The effects of these processes can be emulated with software in digital photography. (Source: Wikipedia)
Even if these photos may look like sepia-toned, these are not sepia-toned. Took these velvia shots of the fiesta procession. I would suspect the defective lightmeter of my LCA+ has produced this effect which I kinda like. They look like images from decades ago. Perhaps I should experiment more using the same camera with other films to find out what exciting results it may produce.