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Stained Glass Glass Opalescent or Opaque - dense glass that cannot be seen thru. A mixture of wispy colors on a white base. Cathedral - translucent colors with no white base. Items can be seen but not clearly. Transmitted light is required to show color. Wispy - has streaks of opalescent and cathedral colors. Items can be seen thru cathedral areas. Antique - this glass, available in clear or colors, has very little movement. Items can be seen clearly. Bevels - typically 3/16" or 1/4" clear or glue chip glass that has a polished angle cut in the edges of the glass. Painted - the application of enamel paints onto glass then kiln-fired at 1250EF. Lead - (used to hold glass pieces together) >H= channel (style of lead) Various widths to emphasize certain areas Bends easily around pieces Deterioration of glass Impacts Accidental - rocks, lawnmower, baseball, ladder, act of nature Intentional - vandalism External stress Deterioration of window frame Settling of building Brace bars coming loose Opening and closing of doors or windows Chemical deterioration Air pollution Water - condensation in closed environment, storm window Alkali - water running down from masonry stone above Repairs Cracks Replace the entire piece of glass Lead overlay Glue Lead - may look good, but may break while removing panel Re-lead part of window Re-lead entire window Re-solder broken joints Bowing, sagging - improperly supported, bad design, heat softens lead, brace bars inadequate Difficult to flatten in place - risk breakage Soften panel with hot water or heat - apply pressure Add brace bars to prevent recurrence Brace bars Saddle bars - copper wire soldered to panel and wrapped around round bars Horizontal only Difficult to bend Flat bars - soldered directly to panel-most commonly used Can be bent to accommodate artwork Can be applied horizontal and vertical Overglazing - (protects glass from outside elements) Usually tempered glass or Lexan Be removable for cleaning Installed with proper ventilation Maintenance Regular inspection every 2-5 years by a stained glass professional Look for breakage, deterioration of lead, broken solder joints, bowing, sash deterioration Preservation - is to maintain and protect the window in its existing state and might involve protective glazing. Restoration - re-establishing the integrity of the window. It may involve replacement of deteriorated lead and redesign structural elements to alleviate bowing or sagging. Repair - usually involves replacement of broken glass and often implies a stop-gap correction of a problem without concern for longevity, appropriateness or appearances. |
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