![Kitchen sink has black discharge from piping. What is it? Is this a simple case of the normals, just reseal the threads? Or is it a sign of something worse. Front bowl Kitchen sink has black discharge from piping. What is it? Is this a simple case of the normals, just reseal the threads? Or is it a sign of something worse. Front bowl](https://preview.redd.it/itpafm77w8w51.jpg?auto=webp&s=2beafcc2340e99dee64c02ef9868e75fc2588a5f)
Kitchen sink has black discharge from piping. What is it? Is this a simple case of the normals, just reseal the threads? Or is it a sign of something worse. Front bowl
My sink is clogged by black gunk and it only happens to the sink I mostly use. Why does this happen and how do I remove it? - Quora
How to clean years of accumulated gunk from kitchen sink piping | Terry Love Plumbing Advice & Remodel DIY & Professional Forum
![bathroom - What is this black stuff that appeared on my drain after cleaning with a bleach-based cleaner and how do I clean it? - Home Improvement Stack Exchange bathroom - What is this black stuff that appeared on my drain after cleaning with a bleach-based cleaner and how do I clean it? - Home Improvement Stack Exchange](https://i.imgur.com/6Ux9Q4o.jpg)