Is this a temporary or permanent position? http://www.academiadecienciasrd.org/combivent-dosage combivent dosage  The mixture containing the dyes in the chiral liquid crystal host is in between two glass plates. The red color is given by the dyes, while the green reflection is due to the helical structure of the chiral host, which selects preferentially this wavelength for the reflection. Courtesy of Dong Wei.