Other yeasts are stated to form sulphurous acid in must and wort.
Galvanized iron by its zinc surface is protected from corrosion by the weather, though the protection is not very efficient in the presence of acid or sulphurous fumes, and accordingly it is extensively employed for roofing, especially in the form of corrugated sheets.
Below Mosul, for some distance, occur sulphurous and bituminous springs.
The immense volumes of sulphurous acid evolved give rise to many complaints; all the minor pits suspend work during the summer to avoid destruction of the crops.
Water decomposes it violently with formation of hydrochloric and sulphurous acids.
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