2010 California Code
Health and Safety Code
Article 3. Closed Containers

112125.  Except when sold in bulk for manufacturing purposes, it is
unlawful to sell or otherwise dispose of at retail jams, jellies,
preserves, marmalades, peanut butter, horse-radish, mayonnaise, or
salad dressings other than in closed containers approved by the
department, when the department determines that any other method of
sale or disposition of any such food or food product is conducive to
its contamination by flies, insects, dust, dirt, or foreign material
of any kind whatsoever.