HI,
What I learned today about black rice, though it probably scratchs the surface.
I talked to one Japanese ex-pat who assured me Japanese do not eat black rice. Very likely most of the Japanese population does not eat black rice, though there are some who do.
I saw one article refer to black rice as the new brown rice. It seems to be adopted by health conscious people for its enhanced nutrition. A higher level of nutrition can be achieved by consuming sprouted sweet black rice. This boost comes at price: $16.99 for a kilo of sprouted rice whereas regular black rice is $6.99 for a kilo.
Black rice still has the kernal, though the rice inside is purple. Black rice is often cooked with white rice rather than by itself. It is suggested you soak a tablespoon of black rice for an hour before adding to rinsed white rice and cooked. You can avoid the soak, though you need to add extra water and expect a chewier rice grain.
I am presently experimenting on cooking it with my new crop Japanese rice.
Regards,