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At the flea market today I bought a typical silver/grey Esterbrook dollar pen. It had what appeared to be some dried ink on the portion of the barrel covered by the cap. No big deal I thought. A little light cleaning in the ultrasonic cleaner would remove it. When I got home I put it in the ultrasonic cleaner and set the timer for 10 minutes. I checked after the cycle was over and found that the water had turned a turquoise color, but the stain was still there. I did not change the water as I typically do, and set the cycle for another 10 minutes. I went back about an hour later to check. The water was much darker and I could not see the parts. I reached in and was shocked to see that the plastic had changed to the uniform teal color you see in the pic below. I wiped the parts down with a cloth, expecting the color to wipe away, but it did not. The entire pen is now stained. However, I quite like the color. Has anyone had a similar experience?
