Glad to see this thread get a bit more attention. Just a few follow-ups.
Thanks to bookbndrbob for the link to car colors, it gets me an idea of the color, but I'm always cautious applying real world coloration to stamps. (The bricks in my house vary a bunch, so which one do I pick to equate to 'brick red' as it appears in the Michel color spectrum?
revstampman, I have already reviewed the Michel guide for English speakers, but hadn't found equivalents to the colors I'm trying to match. It was quite helpful in getting the majority matched up, though, and is a good resource to point out to others using the thread.
Germania, I am going to follow up with a post showing the section of my 2016 Michel Austria Specialized Catalog that includes the list of colors.
This was the source of my green questions (resedagrun and flaschengrun)
The kadmiumgelb entry comes from my 1981 copy of 'Osterreich 1850-1918' specialized catalog by Ulrich Ferchenbauer. Considering he uses the Michel numbering scheme, and his color names are generally a match for that catalog, I assumed he drew from an earlier edition of that catalog for his own compilation.
Just so everyone's on the same page, this is the series of stamps I'm specifically looking at.
Thanks for everyone's help so far.