Originally Posted by Ian Grant
Just about, i'd say.
First efforts were orthochromatic, only blue (and a bit of green) sensitive.
Panchromatic emulsions began to appear, and became common, in the 1910s, certainly 1920s. Verichrome was introduced in 1931, as one of the new generation of panchromatic (!) monochrome films.
The "chrome" in Autochrome however is not about spectral sensitivity, but about the image produced being in colour, and not monochromatic, and dates from the period that people were trying to figure out how to produce images in colour (1870s - 1890s).
The spectral sensitivity of the plates used however is another matter.
The use of the term "chrome" to denote slide films is due to the choice made by the manufacturers to give their slide films the "chrome" suffix, their colour negative films the "color" suffix.
Not a hard and fast rule, but still the origin of "chrome = slide".