What is the reason why color photography theory cannot be put into practice?

Unfortunately, Di Oron’s idea could not be implemented at the time. Because in the 1860s, no photographic material was sensitive to red. Adding a red filter to the lens will result in a very thin or even no image at all. Therefore, it was not until December 1873, when German chemist H.W. Vogel discovered the spectral sensitization method, that the manufacturing of color photosensitive materials had a solid technical foundation.