What is this?

Old 04-07-17, 08:38 PM
Thread Starter
Join Date: Apr 2017
Posts: 2
Upvotes: 0
Received 0 Upvotes on 0 Posts
What is this?

I'm a new homeowner having recently purchased an apartment in NYC. I noticed under my sink tonight a strange yellow / brown rust or mold type thing. I do not know how long it's been around. I'm hoping someone can help identify what it is and if it's harmful. At the very least, I'd appreciate a second opinion on if I should call a professional to help deal with it. Thanks in advance!

Name:  asdfasdf.jpg
Views: 240
Size:  27.4 KB

Name:  qwerwqer.jpg
Views: 217
Size:  35.6 KB
Old 04-08-17, 02:42 AM
GregH's Avatar
Super Moderator
Join Date: Jan 2001
Location: Manitoba
Posts: 9,498
Received 66 Upvotes on 61 Posts
Smile Welcome to our forums!

Looks like dust or dirt that has been sitting on the pipe for awhile.
Why don't you take a rag and some soap and clean it off and see if it comes back.
May have to scrape it if it's been there awhile.
Old 04-08-17, 06:40 AM
Join Date: Feb 2006
Location: USA
Posts: 6,351
Received 60 Upvotes on 52 Posts
Material Identy

Possible pipe thread sealant residue left when galvanized drain pipe was installed. If so, poor workmanship.

Or drywall compound?
Old 04-08-17, 06:53 AM
chandler's Avatar
Banned. Rule And/Or Policy Violation
Join Date: Dec 2005
Location: USA
Posts: 36,608
Upvotes: 0
Received 9 Upvotes on 8 Posts
I agree with pipe dope. But on another note, I would buy and install a stop valve handle as soon as possible. You can never tell when you need to turn off the water to the sink in a hurry, and you can't do it without a handle.
Old 04-08-17, 06:53 AM
XSleeper's Avatar
Group Moderator
Join Date: Dec 2004
Posts: 26,409
Received 1,744 Upvotes on 1,568 Posts
If you call a professional, please call me. I would love some easy money.
Old 04-09-17, 05:05 AM
Thread Starter
Join Date: Apr 2017
Posts: 2
Upvotes: 0
Received 0 Upvotes on 0 Posts
Thank you everyone! I'll see if it comes back after a cleaning.

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: