Process for the production of bleached wood particles and pale to white wood-base materials

A process for the production of a bleached wood particle comprising

• a) milling an optionally pretreated, comminuted, cellulose-containing raw material in a refiner to obtain a wood particle and
• b) removing the wood particle from the refiner,
• wherein said wood particle is bleached in a) or in b) by the addition of a bleach composition consisting of
• i) from 60 to 95% by weight of one or more hydrosulfite salts,
• ii) from 1 to 25% by weight of one or more sulfite salts,
• iii) from 1 to 10% by weight of one or more basic salts selected from the group consisting of carbonates and bicarbonates, and
• iv) from 1 to 10% by weight of one or more tripolyphosphate salts.