What's The Difference Between Cold Press and Hot Press Watercolor Paper?

Have you ever looked closely - and I mean really close at the surface of your watercolor paper? And noticed that some papers have this bumpy texture - whereas others don’t? Is there a purpose? Which one should you use? More importantlyWhat is the difference between cold press and hot press paper? WHY DOES WATERCOLOR PAPER HAVE BUMPS?

Superior Painting & Drawing Pad: Made from 100% pure cotton, 140lb/300gsm heavyweight watercolor papers, acid-free and chlorine-free, pH-neutral and

MEEDEN 5X7 Watercolor Paper Block, Textured Surface Watercolor Pad, Cold Pressed, 20Sheets (140lb/300gsm) Art Sketchbook Pad for Painting & Drawing

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