Yellow water in laser tube

Just did a deep clean on our machine and noticed the coolant in the laser tube looks tinted yellow. Has anyone seen this before? Should I be concerned?

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It almost looks like rusty water.

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Are you sure it’s inside the tube? Yellow and brown gunk builds up underneath the tube, on the metal gantry it’s attached to, which you can see through the glass.


@dan84 yes its inside the tube. I noticed it after cleaning the machine. I take a piece of painters tape with a wife, and fish it under the tube to clean all around it. So it’s not the underside thats dirty and reflecting.

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