The affixes of the parasmaipada are used optionally after the denominative verbs ending in the affix kyaṣa,
The affix क्यष is ordained by sutra 3.1.12 भृशादिभ्यो भूव्यच् वेर्लोपश्च हलः after the words लोहित &c. These roots take optionally parasmaipada. As लोहितायति or ते he reddens. पटपटायति or ते he makes pat pat.,