Is there a product avail to protect a hand crochet curtain from sun damage?

I recently inherited a valance that my 96 year old grandma made. I would love to use it in my living room window, but there is quite a bit of direct sun light in that room, and my mom is concerned it will damage the valance over time. Any one know of a product that will protect the fabric? Thanks!

Spray them with Scotch Guard to resisting fading due to sunlight or just general age.