The only difference between the two is the UV protection. The first is Museum Glass, and the other is what we call UV70. In the modern reflection control glass family, there are two main options available. What is the difference between UV70 and Museum Glass? The result of this is no diffusion issues, so you can have it as close to or as far away from the artwork as you want, and is far more flexible in its application as a result, easily replacing normal sheet glass in any scenario where the piece will benefit from reflection control. Museum glass, and its companion product UV70, control the light in a similar way to modern laptop screens, the formation of the glass helping to minimize glare, and are ultra clear (even sharper than clear glass).
Because having work touching the glass is not something we recommend as it goes against archival framing practices, it isn’t a product that works well in framing most items. The only way to ensure you can see the detail in your piece would be to place the glass in contact with the artwork. As a result though it has a diffusing effect as the glass is not totally clear, so the further away from the image it is from the glass, the more blurry the image appears. The way the traditional product achieved reflection control was by having a slightly etched back to help control the light refraction.
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