If you paint in watercolors, you realize the problems improper paper can cause. You need to have paper that is able to handle the paint without buckling or warping. The last thing you need is to paint a wonderful piece on paper that disintegrates before it even dries. It is important to select the paper you chose with care. It does not matter whether it comes solely or in blocks such as Arches Watercolor Blocks. It is important to look at what factors will help you differentiate good quality paper from poor or bad.