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White residue on vintage aluminum? cookware.........

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I am using one of my grandmother's "majestic cookware" pots- it may be aluminum? I use it to boil water for hard boiled eggs. Every time I use it a white residue appears in the pot. I inadvertently left water in it all nite and there is a lot of this white residue?
Does anyone know what this is? Should I throw the pot away? It is not from the eggs...it is lumpy like it is seeping/budding out from the pot itself....

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  1. The white color on the aluminum is a patina that builds up naturally. You can remove it with a 3M scrubbie, or leave it in place. It isn't harmful, unless you try to cook highly acidic (tomato) foods in the pan.

    1. Throw it away. Acidic food, hard water and salt will create this mess. It isn't worth the trouble to keep the pan clean. It's a chance to try something new.

      1. there's nothing wrong with the pot
        I *think* the white residue is caused by mineral deposits from your water.
        It's easy to remove with a scrubbie.
        Those pots from grandma sell for a lot on eBay . . .

        1. White on aluminum is probably aluminum oxide. Here's a quote from wikipedia:

          "Aluminum is a lightweight metal with very good thermal conductance. It does not rust, and is resistant to many forms of corrosion. Aluminum can however react with some acidic foods to change the taste of the food. Sauces containing egg yolks, or vegetables such as asparagus or artichokes may cause oxidation of non-anodized aluminum."

          Full article at:
          http://en.wikipedia.org/wiki/Cookware...
          (scroll down to Aluminum)

          1. Don't know if this is ok or not, but I know someone who had the same problem and cleaned up her pot with Lime-Away, like you'd use in the bathroom. Said it worked great without any apparent ill effects. (She's still here to talk about it).