Shiva Purana
श्यामेन पीठं पीतेन श्रीकण्ठं च विचित्रयेत् ॥ अमरेशं महाकालं रक्तं कृष्णं च तौ क्रमात् ॥ ११ ॥
The Pīṭha shall be coloured blue. Śrīkaṇṭha in yellow, Amareśa in red, and Mahākāla in black.
english translation
zyAmena pIThaM pItena zrIkaNThaM ca vicitrayet ॥ amarezaM mahAkAlaM raktaM kRSNaM ca tau kramAt ॥ 11 ॥
hk transliteration by Sanscript