How many letters does the top answer for “a colloidal extract from carrageen seaweed and other red algae” have?

The most common answer is carrageenan (11 letters).

Crossword clue: a colloidal extract from carrageen seaweed and other red algae

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

carrageenan 11 letters wn-def

a colloidal extract from carrageen seaweed and other red algae

carrageenin 11 letters wn-def

a colloidal extract from carrageen seaweed and other red algae