My modeste answer seems to be  late, I just read the question. However, it is better late than never! 

Please if you  have more information or publication about the question, I do hope you share it via researchgate so that many of us will benefit from it.

As far as I am concerning,  I suggest he following

Reference 1:

http://www.exportersindia.com/a-international/copper-cement-ahmedabad-india-207003.htm

Cement Copper is a Finely Divided Black Powder. It is Obtained By Precipitation (cementation) of Copper By Adding Iron to the Aqueous Copper Sulfate Solution Resulting from the Leaching of Certain Roasted Ores or Residues.cement Copper is a Finely Divided Black Powder. It is Obtained By Precipitation (cementation) of Copper By Adding Iron to the Aqueous Copper Sulfate Solution Resulting from the Leaching of Certain Roasted Ores or Residues.

Reference 2 for general useful information on thermocouples

http://www.thermalnews.com/conferences/wp-content/uploads/2012/09/FLIR.pdf

Title: The Challenges of Using Thermocouples for Surface Temperature Measurements and the Infrared Advantage

Best Wishes