Processed with alkalai and possibly alcohols.
According to secondary source Wikipedia, “Gelatinous extracts of the Chondrus crispus seaweed have been used as food additives since approximately the fifteenth century.” I’m sure they used different processes than modern industry, but just because a natural chemical is gelatinous doesn’t make it bad.
Grandma made her carrageenan the old-fashioned way!
Good thing overcast skies weren’t invented yet.