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

A process for the production of bleached wood particles comprising

• a) milling optionally pretreated, comminuted, cellulose-containing raw materials in a refiner to give wood particles and
• b) removing the wood particles from the refiner,
• wherein said wood particles are bleached in a) or in b) by the addition of a bleach composition comprising
• 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 and
• iii) from 1 to 10% by weight of one or more basic salts
• or at least one bleach selected from the group consisting of sulfinic acids arid their salts and stabilized sulfites.