Stainless Steel and the passive layer Steel is an alloy of iron and carbon. Contrary to carbon steel, the presence of a minimum of 10.5 % chromium in the stainless steel gives it the property of corrosion resistance. Indeed, on contact with oxygen, a chromium oxide layer is formed on the surface of the material.
Sinus Drainage & Stomach Problems. One of the primary results of sinus congestion is drainage. Sinus drainage is expelled in two basic ways: through the nose and the back of the throat. When sinus drainage is expelled in back of the throat, it is referred to as postnasal drip and can cause stomach discomfort.
Similarly, nasal allergies or sinus congestion can lead to drainage of mucus down the back of the throat, which is usually worse at night. This can give the same sensation of something salty or bitter in the mouth. I suggest that if this symptom persists that you go to see your primary care doctor. They will be able to due a quick exam and help you sort out what is going on and whether you should take a medication to help.