Shiva Purana
अवर्णा वर्णसंयुक्ता प्रोच्यते बिंदुमालिनी ॥ तां पश्यन्सर्वदा योगी कृतकृत्योऽभिजायते ॥ १८॥
It is devoid of colour yet it possesses colour. It is called Bindumālinī. The Yogin who sees it always remains contented.
english translation
avarNA varNasaMyuktA procyate biMdumAlinI ॥ tAM pazyansarvadA yogI kRtakRtyo'bhijAyate ॥ 18॥
hk transliteration by Sanscript