Shiva Purana
विधूमांगारवर्णस्य वर्णा वाद्याश्च लान्तिमाः ॥ मूलाधारारविंदस्य हेमाभस्य यथाक्रमम् ॥ वकारादिसकारान्ता वर्णाः पर्णमयाः स्थिताः ॥ ६९ ॥
The colors of the instruments were of the color of smoke and charcoal The roots of the lotus flowers are golden in color. The letters ending in vākara and s are situated in the form of leaves.
english translation
vidhUmAMgAravarNasya varNA vAdyAzca lAntimAH ॥ mUlAdhArAraviMdasya hemAbhasya yathAkramam ॥ vakArAdisakArAntA varNAH parNamayAH sthitAH ॥ 69 ॥
hk transliteration by Sanscript