BT Nid 20a(10) :פכחותא דדיוטא ,, חרתותא דדיוטא‏ : paleness/darkness of ink
See the entire entry for dyū, dyūṯā n.f. black ink

BT Nid 20a(10) :חרתותא דדיוטא‏ : darkness of ink
See the entire entry for ḥrtw n.f. darkness, blackness

BT Nid 20a(10) :פכחותא דדיוטא‏ : the paleness of the ink
See the entire entry for pkḥw n.f. faded state