How do you determine if a mirror is antique?
There are three points to consider when determining the age of antique glass in a mirror. Although there may be exceptions, understanding these rules can help you determine if it's an antique, a new glass plate or a fake.
I placed a white business card up to both an antique glass plate (left) and a new modern glass plate (right).
1. Thickness: Antique glass is typically thinner then new glass. You can place a business card, as in the photo above, or the tip of a pen right up to the mirror and look at the depth of the glass. Antique glass is usually very thin while new modern glass is not. You can see a very small space between the card and its reflection on the antique glass (left) and a much larger space in the new mirror plate to the right. This shows the depth or thickness of the glass.
2. Color: Antique glass tends to have a yellow or grayish tone to it. New glass has a sharp and bright reflection that better matches the color of the object in the reflection.
3. Consistency: Old glass was typically poured into molds and will show differences in its thickness. New glass is crisp and consistent. Likewise, the beveled edges of antique glass were shaped by hand and are not as consistent as modern bevels cut by machine.
Replacing the glass in an antique mirror will not necessarily hurt its value. I wouldn't consider a mirror more valuable if you want to use it but can't see yourself. Each instance is different and each owner determines the success of any replacement.













