Would it devalue my fireplace to paint it out in white? It is currently gray brick.

I moved into my 1920s house 40 years ago. The previous owner had covered the brick fireplace in a cranberry zbrick. I quickly painted it white as all the woodwork was white at the time and enjoyed it for 10 years. (I painted it blue/ that phase lasted a year or two...and then I went back to white.) I stripped all the woodwork in the house 30 years ago and repainted the fireplace a sage green. It worked. A few months ago I finally finish the project as I always dreamed it should look. The zbrick would have been too difficult to remove so my partner built an oak surround to coordinate with the two wood/glass bookcases on each side of the fireplace . (He is quite the woodworker/craftsman. I can design it, he builds it, I refinish it.) We tiled over the zbrick in the area the wood surround would not cover and then placed our custom made front over the tile. Projects always bring on other projects... I ripped up the wall to wall carpet in the living room and refinished the maple wood floors. My partner built Craftsman frames for over the three mantels and I had Hobby Lobby matt the watercolor paintings I had in storage for years (they were done by my aunt when she retired. I had always wanted to display them!) Keep in mind that once you paint something, unless you're capable of stripping the surface, you are committed to paint. Have you considered painting your bookcases on either side the color of the fireplace? That would be reversible.