What color does a “healthy” and new Co2 laser beam have?
CO2 Laser is invisible.
The beam is invisible. The plasma in the core of the tube should glow purple / pink when healthy, or white when dead.
I asked my question incorrectly but still got the right answer 
, thank you very much.
The color of my laser tube was very pale, almost sickly white and the laser will no longer cut really deep either.
Fortunately, I have a new tube in stock and the laser tube has also already been replaced. The high-voltage connection took some time and was also a bit of a mess with all that silicone. I lack hardening of the silicone, water filling and laser beam adjustment, it’s coming tomorrow.
Skål 
That depends on the manufacturer. The mix of gases determines the flux colour.
EFR/Ruida are a light pink on white. I’ve seen very purple-looking plasma on no-name Chinese tubes.
Regardless, use a meter to determine the health of your tube. Anything else is just guessing.
I have finished the project and have done some tests. It’s unbelievable that I have not noticed the relatively large energy loss until now.
The color of the Laser tube itself is nice puerpel again.
Until now I have no meter to measure the output correctly but the cutting test I have done shows about 40-50% more power compared to the last tests I have performed with the old laser tube.
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