RO tubing color wiping off

[Simon Reefing]

I bought a Tunze ATO used and the tubing was pretty gunky so I let it sit in some vinegar. I wiped the water of the tubing and black was coming off. I know this can happen with vinegar soaking but would you feel comfortable using it? I can not wipe the inside so idk if the inside color will wipe off when using it. Should I buy new tubing or should I be okay to use it and just let it sit in ro water for a few hours?

thank you!

 

[Simon Reefing]

I can post a picture as well if needed

 

[bruno3047]

Was obviously painted. All tubing that I’ve ever used is color consistent throughout. The dried paint probably won’t bother your animals, but why take a chance? Buy new.