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As long as you don't plan on eating them, yes. I mainly use the Tiffany copper foil method and solder containing 60% tin, 40% lead. With certain constructions however, I do use lead came. Glass and lead are only two of the many items not suitable for children. Caution should be exercised by washing hands thoroughly after handling. Common sense tells us not to chew lead and glass so I think we'll be okay.
The whole lead issue ... the information below was compiled from various sources on the internet.
Lead occurs naturally in the environment and has many industrial uses. There is exposure to trace amounts of lead through air, soil, household dust, food, drinking water and various consumer products. Traces of lead are found in almost all food. Airborne lead falls onto crops or soil and is absorbed by plants. Lead is released into air through industrial emissions, smelters and refineries. Dust and soil can be significant lead exposure sources, especially for young children because they absorb lead more easily than adults and are more susceptible to its harmful effects. Lead in soil can come from the air or from erosion of lead-bearing rocks, and may be carried indoors as dust. Lead dust can also be generated within the home, especially older homes that used lead-based paints or lead solder. Lead levels in tap water increase as water stands in pipes. It's a good idea, especially with soft water, to run the cold water first thing in the morning or any other time the system hasn't been used for a number of hours. Use only cold tap water for drinking and cooking since hot water is likely to contain more lead. Drinking fountains may have higher levels of lead than water from nearby taps, because the water usually sits for a longer time. They may also have more soldered joints.
Lead can enter food, especially acidic food such as fruit juice, from lead-based glazes on glassware and ceramics. Pottery or glassware from abroad may contain enough lead to be a hazard to your health. Leaded crystal is widely used for serving beverages but when the crystal comes in contact with beverages, especially acidic beverages such as port, wine, fruit juices and soft drinks, some lead dissolves into the liquid. The amount of lead that dissolves depends on the lead content of the crystal, the type of beverage and the length of time they are in contact with each other. Pregnant women or children should not be served drinks in crystal glasses. Lead fumes or particles can be released when waste oil, colored newsprint, battery casings or lead-painted wood is burned. Candles that contain lead in their wicks may also release harmful levels of lead when burned.
Lots of information can be found on this topic. My point is that with all the other exposures of lead, a stained glass piece of art isn't going to harm you.
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