Water intended for use as an ingredient in the production of beer (brewing liquor) or other foods
In an acidic solution, in the presence of ammonium molybdate, dissolved silicic acid or silicates produce silicomolybdic acid which exhibits a yellow color. After the addition of a reducing agent, a blue color emerges which is proportional to the quantity of the silicic acid present in a certain concentration range.
Boiler feed water for use in the production of beer and other foods