Why does colloidal silver expire?

[Guest guest]

Does anyone know how colloidal silver changes enough to be considered " expired? "

Does the silver come out of solution? If, in fact, it does expire, what would

be the effect of using it anyway? Actually, I want to treat a feral cat with

horrible open sores with the silver in the milk I give him. Can't get near him

to give him antibiotics or take him to a vet. The bottle expires this month,

but it is a large bottle and I want to continue to use it for the cat and take

it myself at times. Any ideas?

Marji