Hi, I have been using two pads about 5 nights a week for 31/2 weeks. The pads were originally alot darker, almost black and smoky smelling when I first put them on last month, and now they are brown/green, very wet when I remove them in the morning. As an antecdotal comparison, I had a magnetic water bath last month, the water changed colors to dark murky, with dark flecks of black floating on top. Last week I had another water bath, and the water was greenish, with fewer floaties on top, and the water was opaque and less turbid. You could see my feet in the water. I think that is proof in that the detox pads are working and less toxins are coming out of my feet. I have another box of 10 to go thru and am planning on sending one for analysis soon.