Whats Proposition 657 Proposition 65 isa California law that esquires warning labels on products that jay contain one of more than 800-plus chemicals or ingredients that the California Office of Environmental health Hazard Embarrassment has deemed to Gauss canter or other reproductive toxicity, chemicals and elements on this Distinguished wood dust , brass , and everywhere substances, which.can be found in very common household items, such as : lamps , tableware , jewelry | crystal glasses .