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While wavy glass is sometimes called antique glass or restoration glass due to the fact that it's found exclusively in older homes, the proper names for wavy glass are actually crown glass and cylinder glass. Most commonly used for circular or portal windows, crown glass was created by manufacturers using a process of blowing and spinning. Meanwhile, cylinder glass was used more commonly because it created large square sheets that could be shaped to fit windows of all shapes and sizes.  

Prior to the middle part of the 1900s, glass manufacturers used a technique that involved blowing glass into cylinder shapes that were then flattened out to create sheets used for windows and doors. This technique often left behind ripples and inconsistencies in the glass.

The methods outlined here are intended for surface scratches—ones that don’t cut into the glass very deeply. For deep scratches, you should consider a more comprehensive glass scratch repair kit. These kits come with abrasives, polishing compounds, and specialized tools designed for removing deep scratches from glass. If you feel uncomfortable tackling a deep scratch on your own, consider calling a local glass repair contractor.

Yes, it is possible to replace only the glass pane in a window without replacing the entire frame. However, this is a complex task that is best handled by a window repair professional. A technician can safely cut the seal, remove the old glass, install the new pane, and ensure it is properly sealed. For double-pane windows, this process involves creating a vacuum between the panes and filling it with insulative gas to restore the window's energy efficiency. Hiring a professional also ensures you select the right type of glass for your needs. This repair is almost always more affordable than replacing the entire window and frame.