Article en anglais du Dr Sandra Illya Prelinghieri, 
Extrait:

Any semblance of the real, dark azure-blue sky of the 1990s is gone, due to these deadly brews.
Our intermittent so-called « blue sky » that millions of us have seen these past six months is, in fact, NOT a return to our real, blue, pre-Chemtrails sky that we had before this deliberately created nightmare began. This is another illusion.
According to Dr. Castle, this « new color blue is due to the chemical compounds Manganese di-Bromo di-Fluoro-Benzidine (salts). They are added to Chemtrails so that light is not reflected; but, rather, these compounds refract both light and dark. Therefore, it works the atmosphere into what is called ‘a coherent phase fiber optics refraction’ in a crystalline (the salts) blue material. So, the sky ‘looks’ blue; but actually it only has the refracted color of whatever color (bright or dark) is above it. »
Dr. Castle told me yesterday, « the color is based on ultramarine blue/violet that has been micronized into aerosolized particulates and deployed into the open atmosphere. » He notes: « This aerosol has 500 times more manganese and a huge level of a toxic dibromo-flouro-benzene compounds. This helps the aerosols stay aloft for longer periods of time, unlike the heavier barium and aluminum. This also has been tested; and has higher levels of arsenic and gallium, both of which have been independently tested by Arizona Skywatch and others. »