The black is deep black and the contrast with the white is very large.
deep
From Old Frisian diāp, from Proto-West Germanic *deup, from Proto-Germanic *deupaz, from Proto-Indo-European *dʰewbʰ- (“deep”).
Ćwicz mówienie i zapamiętywanie " djip " i wielu innych słów i zdań z zachodniofryzyjski .