The Compendium of Caraka 1.22.15

1.22.15

prāyaśaḥ kaṭhinaṃ caiva yaddravyaṃ taddhi rūkṣaṇam/
dravaṃ sūkṣmaṃ saraṃ snigdhaṃ picchilaṃ guru śītalam/
prāyo mandaṃ mṛdu ca yaddravyaṃ tatsnehanaṃ matam//

and generally hard is drying. / A substance that is liquid, subtle, mobile, unctuous, slimy, heavy, cold, / generally dull, and soft is regarded as oleating.