Translations:Chaufferette/21/en

• Pour in the bicarbonate of soda slowly, as the reaction produces CO2 gas, causing the solution to foam.
• This stage takes time, but it's best to get to the end so that all the vinegar reacts. If there is any vinegar left over, be prepared to smell its nauseating odour during the next stage!
• The more warmers you make, the longer the reaction will take. For 5 warmers, you can expect about 20 minutes of mixing.