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Stained glass windows are an important elementin both religious and civil architecture. Stainedglass windows are fascinating art crafts becausethey are multifunctional, e.g., mainly acting asfilters for light and as iconographic supports. Theart of stained flourished in the time period of 1100and 1500, when magnificent windows were createdfor great cathedrals. The stained glass windowswere the major pictorial art form in northernFrance, Germany and England during theflourishing period. It is known that there are therelationship between color and colorants. The colorsin the stained glass are attributed to differentchemical compounds that were added to the moltenglass during processing. The addition of metallicoxides called pot-metal glass changed the color ofthe windows-gold for red, copper for green, cobaltfor blue and soon. Most of the properties of traditional ceramicsoriginated from the fact that their raw materials(natural clays) are nanosized. The practical metalnanoparticles used for the pottery and glass arecopper, silver and gold dispersed in an opticallyclear matrix. Incorporation of metallic silver at theglass surface has remained the usual method toobtain yellow stained glass windows. The electron cloud at the surface of a nanoparticleresonates with different wavelengths of lightdepending upon their frequency at the nanoscale. Depending on the size of the nanoparticle, theelectron cloud resonates with a particular wavelengthof light and absorb that wavelength. A nanoparticleof about 90 nm in size will absorb colors on thered and yellow end of the color spectrum toachieve the nanoparticle appear blue-green.
