There was only apparently one working prism ever made for the process. But it's not clear whether this is because it was so hard to make or there was not much f

There was only apparently one working prism ever made for the process. But it's not clear whether this is because it was so hard to make or there was not much further attempts (or a combination of both). It is not super simple to make a filter for a very narrow wavelength, dichroic filters are generally the main technique and I don't know if they could be made into elements of a bayer-like filter.