U.S. No. 1 consists of onions which meet the following requirements:
Basic requirements:
Similar varietal characteristics, except color when designated as a specialty or mixed pack;
Mature;
Fairly firm; and,
Fairly well shaped.
Free from:
Decay;
Wet sunscald;
Doubles; and,
Bottlenecks.
Free from damage caused by:
Seedstems;
Splits;
Dry sunken areas;
Sunburn;
Sprouting;
Staining;
Dirt or foreign material;
Mechanical;
Tops;
Roots;
Translucent scales;
Watery scales;
Moisture;
Disease;
Insects; and,
Other means.
For size and tolerances see §§ 51.3198 and 51.3199.