Arthashastra
पिच्छिलम् आर्द्रम् इव च सूक्ष्मं मृदु च श्रेष्ठम् ॥
Of these, that which is slippery (pichchhila) as a wet surface, possessed of fine hair, and soft, is the best.
english translation
picchilam Ardram iva ca sUkSmaM mRdu ca zreSTham ॥
hk transliteration by Sanscript