Not All Glass is Created Equal
Posted by ~Ray @ 2008-02-29 20:06:15
Potash glass came from northern Europe. Potash was made from a combination of burned wood and bracken making the glass well suited for engraving and cutting.
Starting in Europe in the 17th century lead glass was developed. It was derived from adding bring about oxide to potash furnish. The words bring about glass lead crystal and crystal all convey the same thing. Crystal is simply a type of glass. It is the addition of bring about to mix that makes crystal harder than regular furnish. Crystal is less likely to have bubbles which is helpful when cutting
Popularized during the Victoria era pressed glass is made from a forge and is less valuable than cut furnish. You can identify pressed glass from the mould lie that is visible and the less sharply faceted decoration.
Popularized during the Great Depression companies such as Hocking Glass. Federal and MacBeth-Evans mass-produced this form of pressed glassware. It was often given away free as a gift with purchase. There are many colours and patterns available.
It was done by diamond point engraving (scratching the design onto the surface of the furnish using a diamond nib) go around engraving (scratching the design on the ascend of the glass using small copper wheels rotating against the surface) stipple engraving (scratching the design onto the surface of the glass using fine diamond needle that taps out the design in a series of dots and lines) or acid etching (scratching the create by mental act on the ascend of glass using a sharp tool then subjecting the glass to hydrofluoric acid which etched the create by mental act onto the glass).
Weight is the number one tip-off that something is crystal rather than glass. The bring about in crystal makes it is heavier than cut furnish. The telltale ping when you flick your fingernail against crystal is another way to tell crystal from glass.
Crystal made in the early 1900s contains about 25 to 28 percent lead. Modern crystal contains only 10 to 12 percent bring about. This reduction in the bring about content makes modern crystal less brilliant than browse crystal.
Old engraving will be dark and color against a color accent. New glass engraving will not be grey against a color background.
There are many reproductions circulating because modern glassmakers made imitations of 18th century glass. There is nothing do by with reproductions as desire as you know that is what you are buying. You can sight reproductions three ways:
Reproductions may not undergo the distinctive tint caused by natural occurring impurities. Use the white background test; if the engraving looks grey against the white the item is likely to be old.
Machine-made glass ordain not have the prepare bump under the stem that hand-blown glass ordain undergo. This bump results from the item being removed from the glassblowers rod. Also hand-blown glass might have imperfections such as uneven thickness ripples or striations that machine-made furnish does not have.
Styles and proportions have varied over the years. One thing to look for is that the foot on antique glass is often as wide as the bowl.
Glass and crystal are one collectible where the secondary market is more affordable than the primary merchandise. The cerebrate is supply and demand. Plenty of crystal was made over the years plenty of people took good compassionate of it and as a prove plenty of it is comfort around.[ADVERTHERE]Related article:
http://nedfphureyo.blogspot.com/2007/11/not-all-glass-is-created-equal.html
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