Board books need strong cardboard to make them resilient and withstand the not-so-subtle force that the toddler and babies impart to them.
There are two categories of paperboard that are used in the printing of board books of children.
Gray board is compressed cardboard that comprises of gray fibers against a white laminated exterior.
White board is similar to gray board except that it is made of white fibers and is regarded to be of superior quality and hence more expensive. Most of the board books, we use white board paper.