Jack Coote in his book "History of Colour Photography" mentioned Alticolor as the last of Lumiere's additive-screen colour camera materials, introduced in 1952. There's a sealed pack of 10 Alticolor films for sale on eBay now:


Could be of interest to Autochrome enthusiasts. One of these rolls could perhaps be 'dissected' to see if the dyed starch screen was used till the end.
Alticolor, like the earlier Filmcolor was on plastic film bases, not glass.