Image Missing: Hearst Museum object titled Shell, accession number 1-10161, described as Olivella shell, white, showing signs of having been baked. Olivella shells are baked in the hot ashes of buckeye wood and white oak bark, being constantly stirred until they turn white and then sifted in a triangular open work basket. Any other ashes are said by the Miwok to turn the shells black. When Barrett was in the field, he noted that one Miwok woman baked these shells in a frying pan which she held over a fire (the ashes were mixed in with the shells). Originally, the shells were sifted with tcamma once they had become white.