Although bleaching is not a process associated with chipboard or mechanical wood production, it is a prime factor in the creation of the super white paper pages of sketchbooks and computer paper. The wood pulp is bleached to whiten the fibres in the paper. Bleaching is also the first part of the process of tinting analogue photos. The bleach breaks down the emulsions and removes the silver nitrates. This turned out to be a bit of an all or nothing process……too little bleach and nothing happened (except a sort of roughing of the top surface). Thick domestic bleach created a sizzling reaction….
The destructive results allowed for the possibility of drawing back on top with bleach (hard to control), watercolour, ink, rotring pen and anything to hand.
All images from sketchbook.