The lighter the seed i believe is harder to germinate because it has not been developed very well, now the color u aim for is grayish brown with strips ,thats like when it is fully developed.
First you want female seed. To tell the seed has big hole on end like moon creator. Males have small. Brown dark seeds are best. Soak in paper towel on plate (no tap water) distilled water only. Dont ever let run dry. Ive germinated green seed but the plants are week and small. When inch long root appeares use tooth pick not your fingers to plant in wet soil. The oil on fingers shocks the plant. When planted re water carfully with drops to remove air from around root. Now your ready for 24 hours of light for 6 days. Good luck and if you have any questions feel free to ask.