Paper-based materials must include an alkali reserve of at least 2% calcium carbonate (CaCO3). The alkali reserve has the ability to capture acids that may be in the air, the photograph, or in the ...

An acid and alkali will neutralise each other and produce a salt and water. This is called a neutralisation reaction. The name of the salt produced can be worked out from the names of the acid and ...

An acid and alkali will neutralise each other and produce a salt and water. This is called a neutralisation reaction. The name of the salt produced can be worked out from the names of the acid and ...