These cells are always actively at work picking out the substances they need, and manufacturing out of them the ferments and acids, or Alkalies, needed for acting upon the food in their particular part of the tube, whether it be the mouth, the stomach, or the small intestine.
"A Handbook of Health"
Woods Hutchinson
Alkalies should not be used, as they darken the surface.
"Ontario Teachers' Manuals: Household Management"
Ministry of Education
2. Do not use strong soaps or Alkalies.
"Ontario Teachers' Manuals: Household Management"
Ministry of Education