California Code of Regulations
Title 3 - Food and Agriculture
Division 3 - Economics
Chapter 1 - Fruit and Vegetable Standardization
Subchapter 4 - Fresh Fruits, Nuts and Vegetables
Article 27 - Lettuce
Section 1438.1 - Head Lettuce, Freezing

Section 1438 provides in part: "damage caused by freezing ... is not serious unless it affects any portion of the head inside of the six outer head leaves."

In determining when the heads inside of the six outer head leaves are affected, "blistering" of the epidermis of the leaf does not in itself constitute sufficiently serious damage to be considered serious under this definition. However, if the tissues in the leaf under this epidermis are brittle or soft or pithy or discolored to any extent, due to freezing injury, the leaf has been affected.

It should be noted here that one of the indications of such damage in the tissues which is serious will cause the leaf, when peeled off the head, to break into small particles.

1. Amendment filed 1-4-71 as an emergency; effective upon filing. Certificate of Compliance included (Register 71, No. 2).
2. Amendment and renumbering from Section 1436.1 filed 1-21-75; effective thirtieth day thereafter (Register 75, No. 4).