Kappaphycus alvarezii Kappaphycus alvarezii Kappaphycus alvarezii, the elkhorn sea moss, is a species of red algae. It is one of the most important commercial sources of carrageenans, a family of gel-forming, viscosifying polysaccharides. Farming methods affect the character of the carrageenan that can be extracted from the seaweed. This alga grows to two meters long and is green or yellow in color. It is very fast-growing, known to double its biomass in 15 days. Different carrageenan types differ in composition and conformation, resulting in a wide range of rheological and functional properties. Carrageenans are used in a variety of commercial applications as
Shades of purple Shades of purple There are numerous variations of the color purple, a sampling of which are shown below. In common English usage, "purple" is a range of hues of color occurring between red and blue. In color theory, "purple" colors are any colors on the line of purples on the CIE chromaticity diagram (or colors that can be derived from colors on the line of purples), i.e., any color between red and violet, not including either red or violet themselves. The first recorded use of "purple" as a color name in English was in 975 AD. "See also under Purple#In