Are vintage cups of light unknown metal a little rusty safe to drink from?

Here's why:

* Rust (iron oxide) is a sign of corrosion. This means the metal is breaking down and releasing potentially harmful substances into your drink.

* Unknown metal composition: Without knowing what the metal is, you can't be sure if it's safe for food or beverage contact. Some metals, like lead or cadmium, can leach into your drink and cause health problems.

* Health risks: Consuming rust or other metal particles can lead to:

* Gastrointestinal issues: Nausea, vomiting, diarrhea

* Metal poisoning: Depending on the metal, long-term exposure can cause serious health problems.

* Allergic reactions: Some people are allergic to certain metals.

It's best to err on the side of caution.

Here's what you should do:

* Do not drink from rusty cups.

* If you're unsure about the metal, dispose of the cup properly.

* Invest in safe drinking vessels made from materials known to be food-safe.

If you suspect you've consumed something from a contaminated cup, contact a healthcare professional immediately.