âFading occurs when any chemical process breaks the sequence of conjugated double bonds constituting the chromophore - the dye moiety that imparts colour.â âSome other dye systems are based on the chromophores triphenylmethane, xanthene, anthroquinone, indigo, and phthalocyanine.â
El Paso (/Él ËpÃ¦soÊ/ ell PASS-oh; from Spanish, the pass) is the seat of El Paso County, Texas, United States. The city is situated in the far western corner of the U.S. state of Texas.
In 2010, El Paso received an All-America City Award. El Paso has been ranked the safest large city in the U.S. for four consecutive years and has ranked in the top three since 1997. As of July 1, 2015, the population estimate for the city from the U.S. Census was 681,124. Its U.S. metropolitan area covers all of El Paso and Hudspeth counties in Texas, and has a population of 838,972. The El Paso MSA forms part of the larger El PasoâLas Cruces CSA, with a population of 1,053,267.