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In page Pressure cooker:

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Pressure cookers are typically made of aluminum (aluminium) or stainless steel. Aluminum pressure cookers may be stamped, polished, or anodized, but all are unsuitable for the dishwasher. They are cheaper, but the aluminum is reactive to acidic foods,[1] whose flavors are changed in the reactions,[citation needed] and are less durable than stainless steel pressure cookers. Some aluminum pressure cookers from Afghanistan are known to be contaminated with lead and imported pots were responsible for the lead poisoning of Afghani refugees in Washington state in 2019.[2][3][4]