You should look at the quality of Autochromes they are the first "real" colour film/plate, if you've never seen original prints made from them then you should make an effort, the colours are extraordinarily good considering the technology and why Kodachrome has that name.

There were a number of colour slide films prior to Kodachrome all additive processes like Lumiere Filmcolor, Dufaycolor, and Agfacolor, but Kodak needed to differentiate their new film which was the first subtractive process from its competitors so used Chrome instead of Color, to indicate the better colour fidelity, for the same reasons Lumiere had used the term in Autochrome aboutb 30 years earlier.

In fact it was some time before a major competitor used Chrome to denote slides, Agfacolor-Neu launched in 1936 a year after Kodachrome and was their subtractive Transparency film. The next chrome transparency films were Ektachrome, again from Kodak.

In 1954 Gevachrome is a B&W film, Gevacolor R (reversal) N (neg), Agafacolor Neg or Reversal, Ilford Colour D (reversal),, same in the early 60's. Probably the first company to copy Kodak is Fuji with the release of Fujichrome in the late 1950's.

The term "Chrome" for other colour transparency films began being added slowly with Agfa and Perutz using it with new films (1964 Agfa had merged with Gevaert and rationalised it's film products) but it only became common to all with the release of the E6 in 1977 when all company's outside the Eastern block moved to E6 as a fully compatible processing system.

Ian