Gaspar invented a working dye-destruction (chromolytic) print process. Some of these prints still exist in beautiful condition. But there were
several major refinements involved before Ciba commercially revived the concept decades later. So technically, he did not invent Cibachrome
or Ilfochrome, but was one of several people working in a predecessor mode. Basically, the medium was saturated with particular dyes during
manufacture, then exposed in the direct-positive mode & developed, after which a strong acid bleach removed the unwanted dyes. This is
entirely different from negative exposure onto chromogenic papers, with the dyes being chemically formed during the chemistry steps, or the
contemporaneous "assembly" color processes like carbro and dye transfer. There is a lot of interesting history behind all this - but I'm certainly no scholar on it. RGB is simply the additive exposure mode, used for Technicolor filming, for example; but I even use it for exposing
chromogenic papers, as well as previously for Ilfochrome - that is, in distinction from ordinary subtractive YMC enlargement.