Carrageenan is that the carrageenan is first dissolved and filtered to remove cell wall debris. The carrageenan is then precipitated from the clear solution either by isopropanol or by potassium chloride. A hybrid technology in which seaweed is treated heterogeneously as in the semirefined process exists, but alcohol or high salt levels are used to inhibit dissolution. This process is often used on South American seaweeds and gives some of the cost benefits of semirefined processing, while allowing a wider range of seaweeds to be processed, however, the naturally low cellulose levels in some South American seaweeds allow them to be
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,