I thought pink came after brown?
Yellow
Green
Brown
Blue
Pink
Black
If you're potting reds then you can choose which colour you want. Most of the time players go for the black because it's worth 7 points and avoid the colours near the top of the table (the yellow, brown and green). BUT when there are no reds left you have to pot the coloured balls in a certain order (as listed above).
So not sure where you've got your information from, but it's wrong.