What are the classifications used to describe grain (barr)?

Primary text

Grain is described using four categories: the type (e.g., 'sabeelah' or 'salmouni'), the provenance or region (e.g., 'hourani', 'balqawi', or 'samali'), the size of the kernels (small or large), and its age (new or old). If a single type of grain varies in color, that variation must also be specified.