Mix with a table-spoonful of vinegar enough powdered chalk to destroy
the acidity. Let it settle--then turn off the vinegar from the chalk
carefully, and dry it perfectly. Whenever you wish to purify an infected
room, put in a few drops of sulphuric acid--the fumes arising from it
will purify a room where there has been any infectious disorder. Care
is necessary in using it, not to inhale the fumes, or to get any of the
acid on your garments, as it will corrode whatever it touches.