Medical experts advise the public on the importance of wearing sunglasses to protect the eyes from UV; for adequate protection, experts recommend sunglasses that reflect or filter out 99-100% of UVA and UVB light, with wavelengths up to 400 nm.
In 2008, a KSLA news investigation found that a substance that fell to earth from a high altitude chemtrail contained high levels of Barium (6.8 ppm) and Lead (8.2 ppm) as well as trace amounts of other chemicals including arsenic, chromium, cadmium, selenium and silver.
These metal treatments are most typically applied in a multi-stage spray washer. Pretreatment chemicals remove organic and inorganic soils (oil, grease, polymers, soaps, oxides and particulate) from metal parts that would prevent powder coatings from mechanically bonding to the substrate.