Has anyone come across this? After just 1 day the tubing of my infusion set and reservoir turned a dark brownish/purple ish color. I changed both the set and reservoir and it happened again. The third time I changed everything I took them from a different box. Same thing happened. I called Tandem and they said they’ve had “a few complaints and they’re not for sure what the cause might be.” I was shocked they didn’t have an answer other than that it might be my clothing. Nope. I thought I’d ask you all.
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Hasn’t happened to me … yet. I have the same setup as you. Sorry I can’t help.
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Yes!
It’s the clothing dye. Happens with “newer” black or blue jeans, black tshirts, etc.
Weird, right? (Wondering how much my skin absorbs into my bloodstream!)
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Ah thank you so much for confirming 
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A couple pairs of my blue jeans turned my leather seat in my Camry to a blueish color.
Oh wow. I didn’t realize clothing could do such. I’ve had a pump for nearly a decade now, and I’ve never had the tubing turn color before.