How ketchup gets silverware spotlessly clean

While ketchup can be a nightmare for fabrics, leaving behind stubborn stains that are difficult to remove, it surprisingly excels at cleaning dirty silverware and even copper cookware. The key to its effectiveness lies in its acidity.
Ketchup has a pH level ranging from 3.6 to 3.9, making it quite acidic compared to the neutral pH of around 7. This acidity comes primarily from its two main ingredients: tomatoes and vinegar. In addition to the pectic acid naturally present in tomatoes, the addition of vinegar (acetic acid) significantly enhances ketchup's acidity and helps extend its shelf life. When ketchup comes into contact with the oxidized layer on tarnished silverware, it reacts with it, effectively breaking it down without harming the material.
Now that you’re aware of this handy trick, you might be eager to give it a try. But how can you ensure you do it correctly? The process is simple. Grab a dish or a plastic container from your kitchen cabinet. Place the silverware inside, then take that ketchup bottle from the fridge and drizzle it generously over the silverware, making sure it’s completely covered. After letting it sit for 10 minutes, just rinse and buff, and watch your items gleam as if they were brand new.
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