Semi-Moist Watercolor Pans, Master Class Pack $197.62 each Brand: PrangPrang Add to cart Prang Semi-Moist Watercolors are still manufactured according to the true, semi-moist formula that's made Prang famous. The result is a brilliantly transparent paint. Perfect for a classroom of budding artists, the Class Pack includes 24, 8-Color oval sets and 12 refill trays.