It’s true that citric acid can be produced from a fungus that causes a type of black mould on fruit, but it is generally recognised as safe. There’s no evidence it is being used to harm the population ...

Citric acid is a compound found naturally in citrus fruits like lemons, limes, and oranges. It's what gives these fruits their distinct acidic flavors. The natural form of citric acid is an ...

The activity works well with anhydrous calcium chloride. Keep the container tightly closed to prevent the material from absorbing moisture from the air. Universal indicator solution is also available ...