English mustard powderRef: 80200431b
English mustard powder. Scanning electron micrograph of a sample of english mustard powder. Mustard is a condiment made from the seeds of the mustard plants (Sinapis hirta), white or yellow mustard, (Brassica juncea) brown or Indian mustard or (Brassica nigra) black mustard.
Magnification x277 at 10cm wide.