Extra light:  No more than 15% shall be darker  than  extra light of which only 2%, may be darker  than light.

Light amber:  No more than 15% shall be darker  than light amber of which only 2%, may be  darker  than amber

WALNUT HALVES

Description: 7/8 or more of the kernel is intact.
85% or more of lot, by weight, are half kernels with
the remainder three-fourths half kernels.
USDA Size Tolerances: No more than 5% smaller
than three-fourths halves of which no more than 1%
may pass through 16/64 inch (6.35 mm) round
screen hole. 

WALNUT PIECE AND HALVES

Description: 20% or more of lot, by weight, are half
kernels (7/8 or more of the kernel is intact).
USDA Size Tolerances: No more than 18% shall
pass through 24/64 inch (9.52 mm) round hole of
which no morethan 3% may pass through 16/64
inch (6.35 mm) and of 3% no more than 1% may
pass through 8/64 inch (3.18 mm)round screen hole.

WALNUT PIECES

Description: Portions of kernels in lot cannot pass through 24/64 inch (9.53 mm) round openings.
USDA Size Tolerances: No more than 25% shall pass through 24/64 inch (9.53 mm) round hole of which no more
than 5% may pass through 16/64 inch (6.35 mm) and of 5% no more than 1% may pass through 8/64 inch (3.18 mm)
round hole included in the 5%. 

WALNUT SMALL PIECES

Description: Portions of kernels in lot pass through 24/64 inch (9.53 mm) round openings but cannot pass through
8/64 inch (3.18 mm) round openings.
USDA Size Tolerances: 10% will not pass through 24/64 inch (9.53 mm) round hole and 2% pass through 8/64 inch
(3.18 mm) round hole.

WALNUT MEDIUM PIECE

Although not covered in USDA Standards, Medium Pieces are a common size classification used in the California
walnut industry. No less than 98% may pass through a 32/64 inch (12.7 mm) screen. No more than 3% may pass
through 16/64 inch (6.35 mm) screen. No more than 1% may pass through 8/64 (3.18 mm) screen.

WALNUT MEAL (DOUBLE DICED)

The smallest form of the California walnut comes in various consistencies ranging from a coarse meal to a fine
powder. Use walnut meal to dust cakes, integrate into dough and batter, and for walnut compounds. Finely
ground walnuts are incorporated into pastas, added to fillings, and used as a thickening agent in sauces.