Yellow Mustard Seed : Small, round, and smooth seeds, pale yellow in color.
Black Mustard Seed : Slightly smaller, round, and smooth with a darker, blackish-brown color.
Aroma
Mustard seeds have a pungent, sharp, and slightly spicy aroma. Yellow mustard seeds have a milder scent compared to the more intense black variety.
Taste
Yellow Mustard Seed : Mild, slightly tangy, and slightly sweet.
Black Mustard Seed : More pungent, sharp, and spicy with a stronger bite.