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Pewter corrodes when it is placed in a humid environment that allows a film to develop over the metal. Under the film, the pewter will begin to corrode.

My suggestion would be to rinse the flask with cold water, and allow it to dry completely before resealing the lid. If you live in an environment where you have humid, hot summers, I might even place the flask in the refrigerator as it drys. Try using some sort of rack that allows the flask to stay upside down, ensuring that all water can escape (gravity) and air can freely circulate (keeps humidity low).

Never add anything other than alcohol, like a mixed drink or mixer, as these liquids are harder to clean and dry, and can allow films to develop if the flask if full for long period of time. Hope this helps!

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Q: How can you keep the inside of your pewter flask from rusting or corroding from the inside out?
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Related questions

Will acidic drinks ruin a pewter flask?

Yes. They can also be dangerous in an old pewter flask as pewter was once made with lead. Steel and glass are the best materials for a flask.


Is pewter or stainless steel better for a flask?

Pewter is an alloy made mainly of tin. It used to contain lead, so an antique pewter flask may not be a good idea to use. New Pewter does not contain lead. Pewter can also react with anything that is acidic giving the beverage a metallic taste. It also oxidizes giving it a tarnished look. Stainless steel does not oxidize, and thus will not react with acids giving a visual change in the metal, nor an off-flavor. It is also lighter. I suggest Stainless steel for a flask. In days of old stainless was not available so pewter was used. Stainless is cheaper and will offer better flavors with acidic beverages.


If you cool a flask to -200degrise what would happen to the air?

I the flask was sealed, the air inside of the flask would take up less space and as a result, cause a drop in pressure inside the flask.


How does a thermos flask reduce conduction?

There is air between the inside and outside of the flask.


Must a flask be a good conductor of heat?

so as to keep the flask hot hereby keeping the hot water inside the flask hot.


The color of a vacuum flask in the inside?

white


When the water level is higher inside than outside the flask is the gas pressure in the flask higher or lower or the same as the atmospheric pressure?

The gas pressure in the flask is lower than the atmospheric pressure when the water level is higher inside than outside the flask.


Why was it necessary to match the water levels inside and outside the cooled flask before removing it from the water bath?

So to equalize the pressure inside the flask with that of the atmosphere.


Why is the inside part of the thermos flask shiny?

It helps to insulate the thing inside the thermo flask. The heat or coldness outside the flask gets reflected away. It might sound silly but it is true


Why did the water rush into the erlenmeyer flask when it was submerged in the cold water?

1. When the flask was placed into the cold water, the colder air molecules in the flask move slower, putting out less pressure. With the decrease in air pressure inside the flask, the now greater pressure outside pushes water into the flask until the pressure inside equals the pressure outside.


How do you make a balloon reverse it's position without anyone touching it so that it inflates outside the flask rather than inside the flask?

Once again, heat the flask with the balloon on the inside. The cooled molecules will speed up again, creating energy. If the flask is left on the heat, the air pressure will grow, causing the balloon to be pushed back to the outside of the flask.


Vacuum is mantained in thermos flask?

The vacuum reduce heat loss by conduction and convection.