I'm planning of recycling used paper. I first shred the paper into small bits, grind and blend the paper bits into a thick pulp by adding water and color (white dye or something else) and then flatten it with a hot press to produce a recycled paper. I want to add color to the pulp so that the paper I've recycled has a white color. The problem is I don't know what dye or chemical I should use in order to color the paper pulp white. Any suggestions?
EDIT: Please note I would like to prefer a dye or chemical that is environmentally friendly.