Look at Frederic Mocellin from France. I contacted with him and he says he tried to collect all information to create a autochrome for years and than French book - I gave the writers name in this thread - came to life and he used all the information from the book. He says it is too long to tell the whole process at the mail football and he says this book is the bible and everyone can do with it.
Look at the pictures , absolute success .
May be the new lenses are too sharp or differently sharp for this process.
If someone tries all and calibrate the colors , there will be success with old lenses.
pe , you know this guy , I found at your older posts.