Here we see a chemtrail being sprayed, against the backdrop of a chemmed-up sky, where other aerosols have spread out after being sprayed. You can see a dark line under the chemtrail, looks like a shadow. But we have seen some of these dark lines preceding the spray-plane, as if the plane is following it. See arizonaskywatch.com for related information, and air sample tests showing which metals are being sprayed and their effects on health and the environment.