It was used as a sealant on baskets to make them watertight for carrying water, possibly poisoning those who drank the water.
ɪt wʌz jˈuːzd æz ɐ sˈiːlənt ˌɔn bˈæskɪts tə mˌeɪk ðˌɛm wˈɔːɾɚtˌaɪt fɔːɹ kˈæɹiɪŋ wˈɔːɾɚ, pˈɑːsᵻbli pˈɔɪzənɪŋ ðoʊz hˌuː dɹˈæŋk ðə wˈɔːɾɚ.