Glass that keeps pictures from fading in the sun

[jnglmassiv]

I asked a somewhat related question earlier in the year. I still have the posters in hiding.

Household UV-blocking glass testing

I’ve got some posters that are matted and under glass. However, I don’t know if the glass has anti-ultraviolet light properties and I don’t want to display them until I’m sure they’re safe. Is there a way I can test with household items?