· Lead acetate paper ascertains the presence of hydrogen sulfide
· Hydrogen sulphide form while processing raw oil
· Low concentrations can be toxic hence the requirement to check at certain points of the process
· Can also be used to determine levels of sulphide in drinking water, well water or groundwater
· Sulphide containing solutions turn the paper from white to brown-black
· Thiols, thioketones or mercaptans do not provide a response to this paper
