Viridian Picture Framing Offers you three levels fo framing quality:

Conservation Framing (most used) uses buffered, acid-free mats to prevent yellowing and staining of your artwork, along with UV conservation glass to prevent color fading and paper degradation.

Preservation Framing (lasting for generations) uses 100% cotton rag paper (good for 150+ years) with museum quality glass that is UtraViolet, ray-blocking, anti-reflective (no glare), and water white (no green tint ) with 15% more light passage to see your artwork better.

Decorative Art Framing (most affordable) uses regular glass and backing for projects to be enjoyed for a few years before being replaced.