[july]

Hello.

I am trying to locate a test method to test for the presence of sulfur on copper coils.  The coils are a black color with places of green after they have reacted with sulfur.  The black area is thought to be copper sulfide and when reacted with hydrochloric acid would produce hydrogen sulfide gas, which could be detected by lead acetate paper.

I have tried this test at room temperature and at 100 F.  Does anyone have any suggestions how I might get this test to work or possibly know a more applicable test? 

I thought maybe the substance on the coil was actually copper sulfate, in which case the lead acetate paper would not give a color change because no hydrogen sulfide gas would be produced.

What do you think would be formed from sulfur reacting with copper?  Maybe I am wrong in my thinking.

Thanks for your time.

July

[UnintentionalChaos]

In what way is the copper being exposed to the sulfur? That could significantly affect what is being formed on the coils.