I had two sacks of musk-one was moist, and the other was dry. I started with the moist one and sold it. Then I took the dry one to sell, but I found that I was not offered the price it was worth, and they would not pay me more than the price of the moist musk. So I asked Imam (as) about that, whether it was permissible for me to mix them. Imam (as) said: "No, unless you inform them." He said: "So I mixed them and then informed them." Imam (as) said: "There is no harm in it if you inform them."