GD1 designates a coated secondary fibre board, insert and back grey
(chromo duplex board), top side wood-free white, with special volume (> 1.45 cm³/g).

Front side top layer = hf white
Inlay = grey
Back cover layer = grey

hf white: wood-free white layer of bleached pulp with a maximum of 5% mechanical pulp

grey = layer of recycled pulp (reused cellulose and groundwood fibres)

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