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What is this yellowish gunk on this tube?

I have an old little piece of cut up tube from when I installed my water cooling because if I remember correctly the length was too long. Anyway little piece of tubing is slowly changing color and is scares me. I poke at it with a pencil and then through away the pencil. What the heck is it?

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  1. Best answer
    Looks like it could possibly be flux or oily residue from new components. If the tubing was cut from where it connected to a fitting, the yellow area might be where the turbulence from the fitting entry caused residue to deposit on the tubing walls.

    That's my initial guess, but might be others.
  2. I could taste it. Although I don't think that would be very affective. And I would need a reference of what the different causes would taste like. And a doctor.
  3. Best answer selected by melikepie.
  4. This topic has been closed by Rubix_1011
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