I am sprouting mung beans to eat.
I sprout them in a clear plastic container with the opening covered in a mesh.
I place the container, opening down on the kitchen counter covered in one of those blue cleaning cloths.
Everyday, I cover the sprouts in water, drain them and put them back on the counter.
They grow quite well, but around day 3/4 they start putting out more roots and turning green.
How do I keep the sprouts white?
Update: In addition to completely covering the sprouts, I read that weighing them down was important for fat sprouts. To do this I used a plastic bag filled with rice so that that my weight would fill any shape bowl I used. I am not sure if this was beneficial. But it certainly didn't hurt.
I also used a plastic colander. This had too many holes. Extraction of the sprouts was annoying.