Due to the reaction between its components resulting in its decomposition, aqua regia quickly loses its effectiveness (yet remains a strong acid), so its components are usually only mixed immediately before use.
Oleh karena reaksi antar komponennya menyebabkan dekomposisi, air raja cepat kehilangan efektivitasnya (meski tetap asam kuat), sehingga komponen-komponennya biasanya dicampur segera sebelum digunakan.