If the paper has a watermark you should use the side where the mark is read correctly. If it does not have a watermark but has deckled edges, you should use the side where the edge is smooth not beveled.

If neither, then one trick I learned is to wet the paper and hang it by one corner, the paper will curve towards the "smooth" side.

Quote Originally Posted by Neil Poulsen
Does is matter which side of the paper one uses for Cranes Natural White or Bergger's Cott 320? It's difficult distinguishing one side from the other. If the two sides are different, what side should one be using for Pt/Pd printing?