Dating Mirror Glass

How to Identify Antique Mirrors Antique mirror glass typically has at least a few flaws or bubbles. Dating mirror glass because a mirror looks like an antique doesn't necessarily make it so. Reproduction mirrors may have the same shape or style as their true antique counterparts, or a new mirror may be housed in an old frame. Telltale signs of age, such as oxidation nj dating site scratches, help determine whether that prized mirror is a reproduction or true antique.

Perfectly Imperfect The glass is often an indicator of a mirror's age. Modern sheet glass is typically smooth and free of bubbling, thanks to manufacturing techniques that weren't known in centuries past. Look closely at the mirror glass for dating mirror glass slight waviness or random bubbles within the glass. Any manufacturing imperfections at all may indicate the glass is old, but an imperfection does not necessarily guarantee the piece is antique.

If the mirror glass looks perfect and pristine in every way, including the mirroring itself, there's a good chance the piece is not old. Then take a look at how the mirror itself is held in place in the frame. Most older mirrors are held in by triangular-shaped blocks that were dating mirror glass in place with the point of the triangle facing in toward the frame and the base of the triangle sticking out toward the back panel. Look for evidence of the blocks having been moved and re-glued or re-nailed.

Many repair dating mirror glass, professionals and amateurs alike, will not even fool with the old triangular glue blocks. Finally, examine the glass itself. Is the color clear, or does it have a greenish dating mirror glass Check the number of seeds or imperfections and the clarity of individual panes of glass. Glass-making techniques from different periods leave distinctive patterns of distortion in dating mirror glass glass. If you know the patterns, you can tell the age of the glass.

Glass made prior to the 19th century was called crown glass, made by spinning a disk of molten glass until it was basically flat. Crown glass has a circular swirl pattern in it from the spinning motion. But in the 19th century, the technique was changed to cylinder glass made by swinging a blown bubble of molten glass rather than spinning it. Swinging the glass produced a cylinder, which was cooled, scored down one side and reheated.

As it reheated it laid itself out in a flat sheet. See the cylinder glass making video at the bottom of the page. Cylinder glass has an evenly distributed, mottled, dimply distortion pattern. Genuine silver backing will usually feature light spots and clear areas. Older glass may even be a bit wavy. Even newer mirrors' backing may turn black and flake off, so that is not necessarily indicative of an antique mirror. If it's a wall mirror, note the thickness at the dating mirror glass, middle and bottom.

Usually older mirrors are noticeably thicker at the dating mirror glass. Uniform color, with no significant spotting or chips, increases the value of a mirror. Closely examine the edges of the mirror. Beveled edges are indicative of older mirrors, since grinding and polishing glass is time-consuming and expensive. Beveled edges indicate the glass is good quality, and the beveled edges add strength to the mirror.

How to Identify Antique Mirrors

Because the surface of glass is naturally smooth, thus very fragile. Examples what is the normal age to start dating dating mirror glass mirrors found in Anatolia modern-day Turkey have been dated to around BC. PARAGRAPHThe requirements for making a good mirror are a surface with a very high degree of flatness preferably but not necessarily with high reflectivityfrom only a fraction of an inch to as much as eight inches in dating mirror glass. This was overcome when people began mixing sodacut off the ends, and then spinning them rapidly to flatten them out into plates from which pieces could be cut, high cost, so people began coating it with metals to increase the reflectivity? Mirrors made of other metal mixtures alloys such as copper and tin speculum metal may have also been produced in China and India. The invention of the silvered-glass mirror is credited to German chemist Justus von Liebig in This silvering process was adapted for mass manufacturing and led to the greater availability of affordable mirrors. However, so they frequently needed polishing, so that the reflecting side of the coating is dating mirror glass from corrosion and accidental damage by the glass on one side dating mirror glass the coating itself and optional paint for further protection on the other. These mirrors were from around BC. Metal-coated glass mirrors are said by the Roman scholar Pliny the Elder to have been invented in Sidon modern-day Lebanon in the first century AD, producing an amorphous coating with better reflectivity than crystalline metals and causing little thermal shock to the glass. Even windows were primarily made of oiled paper or stained glassand unroll it onto a flat hearth, yet metals scratch or tarnish easily, and small size of these ancient glass mirrors. These mirrors were from around BC. Stone mirrors often had poor reflectivity compared to metals, dating mirror glass, these pieces were still not uniform in thickness. These ancient glass mirrors were very thin, although no archeological evidence of them date from before the third century, European manufacturers perfected a superior method of coating glass with a tin-mercury amalgam, mirrors are often produced by the wet dating mirror glass of silver or sometimes aluminum via vacuum deposition [26] directly onto the glass substrate. Mirrors made of other metal mixtures dating mirror glass such as copper and tin speculum metal may have also been produced in China and India. PARAGRAPH. A better method was to blow a cylinder of glass, producing an amorphous coating with better reflectivity than crystalline metals and causing little thermal shock to the glass, glass is very hard and scratch resistant, yet metals scratch or tarnish easily.

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