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 art and history the section "In prehistory and the ancient world: Tyrian purple" " "Tyrian purple" is the contemporary English name of the color that in Latin is denominated ""purpura"". Other contemporary English names for "purpura" are "imperial purple" and "royal purple". The English name "purple" itself originally denominated the specific color "purpura". "Purpura" is the color of a dye extracted from a mollusk found on the shores of the city of Tyre in ancient Phoenicia (contemporarily in Lebanon), which color in classical antiquity was a symbol of royalty and political authority because only the very wealthy could afford it,