Is it illegal/misdemeanor for a private individual to sell their own used mattress in California?

“California, for example, prohibits the sale of used mattresses with visible stains or soiling. Used mattresses that contain yellow tags indicate that the mattress has been sanitized and clean. The red label defines the contents of a rebuilt mattress and the types and amounts of used material in the mattress. In states with resale laws for used mattresses, the law does not apply to individuals selling mattresses, only businesses or retailers.”