A California man has filed a lawsuit against Utz Quality Foods Inc. for allegedly falsely advertising that its Dirty Potato Chips brand was “all natural” and preservative-free. Cyprus Hashtpari claimed in the suit, filed May 18, that the Dirty Potato Chips products contain “non-natural, artificial, synthetic ingredients and preservatives,” despite conflicting advertising on the chips’ bags. The offending flavors named in the suit are mesquite bbq, jalapeno heat, sour cream and onion, sea salt and vinegar, funky fusion, cracked pepper and sea salt, pesto and parmesan and smoky chipotle. Representatives from Utz were not immediately available for comment Tuesday evening. More