Went looking for a photo of yellow 3 today but didn't find one, sadly.
NJ most of the time (period) the white was a 1/3 portion on the spinner. The rest of the spinner was Black-Green RLM70.
Couple of examples...F-4's
Yellow 1 + - no white wingtips, Green Spinner white not visible.
Yellow 2 + - no white wingtips, Green Spinner white not visible.
Yellow 9 + - no white upper wingtips, lower not visible. Green/White spinner just visible.
Yellow 12 + - no white wingtips, Green Spinner white not visible.
Yellow 5 and 6 + - G-2's no white wingtips have the 1/3 white spinner.