Question

Which of the following ion produces a toxic effect in the brewing process?

(a) Manganese

(b) Calcium

(c) Copper

(d) Sulphate

The question was posed to me by my school teacher while I was bunking the class.

Enquiry is from Brewing Process topic in portion SCADA System for Bioreactors, Beer and Brewing of Fermentation Technology

Answer 1

Correct answer is (c) Copper

To explain I would say: Copper is an ion present in water that produces the toxic effect to the brewing yeast at high concentrations. It eliminates H2S from beer as insoluble sulphide. It may also produce hazes and produce adverse colour changes in beer.