Digestion or precipitate ageing happens when freshly formed precipitate are left, usually at a higher temperature, in a solution from which it is precipitated. It results in cleaner and bigger particles.
Generalic, Eni. "Digestion." Croatian-English Chemistry Dictionary & Glossary. 29 June 2022. KTF-Split. {Date of access}. <https://glossary.periodni.com>.
Glossary
Periodic Table