An AP investigation has found that, barred from using lead in children’s jewelry, some Chinese manufacturers have substituted cadmium — which is more dangerous. The AP tested one piece of jewelry that was 91% cadmium by weight. The heavy metal is a known carcinogen and is used in rechargeable batteries, pigments, electroplating and plastic. Children can ingest the cadmium by sucking or biting on the jewelry. They do not need to swallow it.