Examination of effects of contamination of naturally white cotton with naturally colored cottons


  • Dean Ethridge
  • Gustavo Abdalah
  • William Cole


The commercial availability of naturally colored cottons has inevitably raised concerns about contamination of naturally white cotton. Until recent years, the objective of cotton breeding programs has been to prevent the genes that impart Nnan-white" shades to cotton fibers from being expressed in the commercial varieties produced. But these natural colors are now being marketed as specialty fibers that, up to now, go through the textile manufacturing process without being dyed. The colors expressed within the existing gene pool of global cotto ns are limited to brown, red and green spectra; shades may be varied by blending these fibers with naturally white cottons and with other colored cottons. It is well known that the cottons designated as being naturally white are not uniform. The Upland cottons from different production areas and regions have different degrees of "yellow_ ness" and the extra long staple (