Why can't keep coffee in stainless steel bottle?
First, chemical reaction
The corrosive effect of tannic acid
Coffee contains tannic acid this acidic substance, when the coffee is in contact with the stainless steel cup for a long time, the tannic acid will react with the stainless steel, which may cause mild damage to the stainless steel cup, and it is easy to produce chemical reactions. This reaction may affect the life of the cup and may also change the taste of the coffee. For example, it may give coffee a bad taste, such as a metallic taste. This point of view is mentioned in 1.
Risk of dissolution of metal elements
Stainless steel is an alloy composed of iron, chromium, nickel, molybdenum and other metals. Coffee is an acidic substance, if the stainless steel cup and coffee contact for too long, iron, nickel and other metal elements may react with coffee, there is a risk of harmful substances. Therefore, from the perspective of health and safety, it is not suitable to use stainless steel cups to make coffee for a long time. This is explained in detail in section 3.
Second, the impact of taste
Prolonged heat retention destroys the taste
Stainless steel thermos cup has good thermal insulation performance, if it is used to make coffee, coffee will be in a long-term thermal insulation heating state. This will destroy the taste of coffee, make coffee drink more bitter, affect the original flavor of coffee. This situation is mentioned in paragraph 1.
