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The outer shell provides a natural protective layer helping to maintain the quality of the nut. Much of the early harvests are traded 'in-shell'.
In terms of volume production and exports, walnuts are mainly from the USA, China, Chile, Eastern Europe and India.
Walnuts are primarily graded by colour, e.g. Light, Light-Amber, Amber and so on, and then further graded by percentages of halves to broken (e.g. 40% halves), or if broken pieces, by size of piece e.g. quarters, large pieces etc.
Walnut Pastes and ButtersMORE INFO