Is it possible for a crystal vase to get rust on it? If so how to clean it?



Answer:
possibly

if the crystal is leaded crstal, you could see lead oxidation (rust), you would just need some bleach. Nitric acid is nasty stuff and not readily available. Muratic acid (pool chlorine) could also do the trick.

if the crystal is not leaded, then there should not be any oxidation (rust).

the crystal could be chipped and some metal particles are residing in the chip and they may be causing the oxidation (rust)
No, crystal does not rust. Metal rusts...
They make crystal-cleaner, buy some.
Rust cannot form on a crystal vase, as it contains no metal that can undergo oxidation.
crystal by definition contains lead, otherwise is just glass.

I don't think it's possible, because the lead inside the glass is already oxydized ! it's PbO the stuff inside the crystal.

Also Pb rust should be yellow to orange-red in color, very different from the Fe2O3 "rust" color.
Sure, if you left a wet iron rod sitting in there too long that might do it, use HCl, to get to rid of it, use Limeaway®. Be sure to wear rubber gloves as to not burn your skin! Rust dissolves in HCl like salt dissolves in water!

Fe2O3(s) + 6H+(aq) --> 2Fe+3 + 3H2O

The H+ comes from HCl

so:

Fe2O3(s) + 6HCl(aq) --> 2FeCl3(aq) + 3H2O(l)

the FeCl3(aq) simply washes away

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