How to pronounce 色素 in Cantonese (5 out of 6):

色素
The bottom color.

Cantonese Sentence Breakdown

haa6
down
downwards
below, under, underneath
lower
later
next (week etc)
second (of two parts)
to decline
to go down
to arrive at (a decision, conclusion etc)
inferior
色素 sik1 sou3
coloring