The "good" side of some hot press papers without a water mark such as Crane's NW Cover 90 can be very difficult to determine. One method is to wet a piece and let it dry. The good side will le the least textured side. Another method I've used is to inspect the paper with a loop and look at the structure of the paper grain. The good side will have a smoother looking structure, the other side will have a rougher slightly textured look. For me it is difficult to tell the difference with my eyes alone.
Originally Posted by Photo Engineer