My Proof set is toning Please help

I recently bought a proof set from Jamaica 1974 and it looks beautiful, the 1 dollar already toned badly when it came but now the Ten dollars, the main piece has also started toning(the coat of arms), it wasn’t like that a time ago, please help and tell me what I should do.

Put it in a vacuum chamber, suck the air out, then seal it off. Or live with it and enjoy the colors.

Not much you can do while living in a country with tropical climate. If you have a climate controlled room (stable temperature, low humidity) store them there.