Crimson is a deep purplish-red. (from dictionary.com).
I did a search on Hawaiian Dictionarys (http://wehewehe.org
). I couldn't anything for crimson then I did a search for red which brought up 'ula.
Looking at the synonyms listed I found weo. Weo was defined as -weo
1. nvs. Red, redness; to blush. See ex., pano. (PCP weo.)
2. n. Dried banana bark, perhaps so called because of a reddish color.
3. n. A variety of taro. Also mana weo (PCP weo.)
This is probably the word you're looking for.