What is this yellowish gunk on this tube?

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melikepie

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Dec 14, 2011
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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?

zEDiv7y.jpg
 
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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.

rubix_1011

Contributing Writer
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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.
 
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