This product stores well under most conditions, but high temperatures and direct exposure to light will dry the material out. Dead Sea salt retains natural moisture from the air and will stick to the skin. This process is normal. The grade of salt offered by my supplier is typically marked a "Fine Grade" and its particle size is a US #10 Mesh These salts are generally used for Prosperity, protection, purification, consecration of ritual tools. Sprinkle a few grains around your sacred space to clear it of any unpleasant presences. Some ancient rituals call for pouring dry salt into a receptacle of water to symbolize the dissolving of evil. Add 2 tablespoons to any herbal bath brew to help relieve symptoms of arthritis psoriasis, pain and stress. This may also be used as ritual salt.