कालाच्च

Operational rule vidhi

The affix कन् is added to the word काल when it means a passing colour or dyed with colour.

Word by word (padaccheda)

Left context कालात् pañcamī · ekavacanaIndeclinable च avyaya

Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
Indeclinable An avyaya such as च "and", वा "optionally", न "not".

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Full reading

कालात् च

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

The affix कन् is added to the word काल when it means a passing colour or dyed with colour.
The word वर्णेच अनित्ये and रक्ते are both understood here. Thus कालकं मुखं वैलक्ष्येण "the face black with shame or confusion". कालकः पटः 'a cloth dyed blue-black'. कालिका शाटी ॥

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.