In accordance with the guidelines published by Japan's Ministry of Health, Labor & Welfare regarding tableware safety (Article #0811001, A:12), 2000 Cranes advises that raku bowls be used solely for the purpose of preparing matcha green tea.
Acidic foods or liquids (ex. vinegar-dressed foods, fruit juices, wine) have the potential to release trace amounts of lead in the glaze and, thus, should not be used with raku ware.
Raku Glazes
