HP inks (inkjet printing supplies) are safe when used as intended.  

HP inks undergo rigorous testing and strict quality control procedures to minimize any risks from chemical substances used and to ensure product safety. HP products are labeled in accordance with applicable regulations and additional safety information is provided in the inserts of HP inkjet print cartridge products. While safe when used as intended, HP inks are not designed or intended to be orally ingested, inhaled, or to remain in contact with skin for prolonged periods. 

Additional information is available on the Safety Datasheet for a given cartridge, which can be found at www.hp.com/go/msds.

Currently, no HP inks are designed or approved for direct food contact applications and accordingly they should not be used for food applications or direct food contact applications.

Government regulatory agencies in the United States, European Union and other regions of the world have strict regulations in place to protect food supplies. These regulations apply both to chemicals that may come into "indirect contact" with foods (e.g. inks used on product packaging), as well as those chemicals that come into direct Contact" with food and are incorporated into a food product (e.g. food colorants).