Just wondering if anyone knows if vacumn tubes are color coded?

I have some
red
blue
yellow
thicker black

I had a red to dis vac
I cut a blue one as its all I have

It was a small piece & I could get to it so I replced it

Just wonering it the color helps trace it
as all those that go to the quad except for the yellow & green can valve are red lines?

Suppose the car doesn't care
just might be easier to trace lines?

There are black ones behind WUR
they come from far behind 7 ru along intake manifold...

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83 500 SEC Euro 198K