Un-toasted seaweed, "Nori" is black and needs to be toasted before use. "Sanchi"
branded nori comes un-toasted. To toast it you place it under a very hot grill
for a few seconds.. and you need to watch it carefully.. it toasts very quickly.
It will turn dark green when ready. Alternatively you can take the easy way
out like me and buy it already roasted. The brand I buy is "Yutaka"
Nori Seaweed is very good for you. It contains iodine and minerals. Nori
Seaweed is used for the maki rolls and
for the larger hand-rolls (Teka Maki) which are very tasty.