Since it's not in this year's book, I'll direct you to page 2 of last season's Rules Book.
2004-2005 NFHS Basketball Rules Book on page 2 has:
"2004-05 NFHS Basketball Rules Changes
1-5-2
1-13-2
Deleted the requirement for contrasting colored lines for the lane spaces/neutral zone with the lane boundary lines and the coach-ing box line with the boundary lines."
How's that for ya?